Code-Switching's Indexicality: A Comparative Semiotic Analysis of Mexican-American Teen Discourse

We define code-switching as the fluid alternation between two or more linguistic codes—typically distinct languages, dialects, or registers—within a single conversational turn, utterance, or discourse, not just a superficial feature of bilingual speech. Instead of serving only as a pragmatic crutch to fill lexical gaps or compensate for limited language proficiency, it acts as a core phenomenon in sociolinguistic and semiotic study, a multifunctional resource carrying layered social, cultural, and personal meanings that shape how Mexican-American teens—embedded in the linguistic and cultural interface of U.S. English and Mexican Spanish—build and negotiate identity, mediate social ties, and navigate daily overlapping cultural fields. We frame this practice not as a deviation from monolingual norms but as a structured, rule-governed set of behaviors. These behaviors hold inherent indexicality, a capacity where specific linguistic forms can point to or signal extra-linguistic social categories, stances, or situational contexts that underpin conversational meaning for all participants.

We use semiotic analysis, which centers on the study of signs and their role in constructing meaning, as a critical framework to unpack the indexical functions of code-switching among Mexican-American teens. Unlike standard sociolinguistic approaches that fixate on structural patterns or statistical correlations with demographic groups, this kind of inquiry puts first the interpretive ties between linguistic forms and the social meanings they evoke for speakers; for instance, a teen shifting from English to Spanish to reference “abuela” (grandmother) may signal both familial closeness and deliberate alignment with Mexican cultural values, while a switch to English for school talk may point to orientation toward mainstream U.S. educational norms. This shift lets us move beyond describing usage to exploring what it means for speakers and their local communities.

This work pushes back against monolingual ideologies that frame bilingual speech as incomplete or unregulated, views that marginalize Mexican-American teens caught between cultural assimilation and heritage preservation. Teens often face ongoing pressure to stick to single-language norms in schools, workplaces, and other institutional spaces, where code-switching is labeled a sign of linguistic deficiency, but we use comparative semiotic examination of natural peer conversations from urban and rural Texas to show it’s a sophisticated, context-aware practice that lets them assert agency over their identity and communicate nuanced social stances. Centering speaker perspectives helps build a more inclusive view of bilingualism as a valuable linguistic and cultural resource.

We unpack the layered indexical meanings of code-switching in Mexican-American teen discourse by analyzing specific patterns—like intra-sentential mixes of English verbs and Spanish noun phrases, or inter-sentential shifts to mark topic changes—and their links to social variables: interlocutor relationship, conversational topic, and setting. By bridging sociolinguistic structure and semiotic meaning, we offer a more nuanced account of how bilingual youth use language to navigate complex social and cultural landscapes, while adding to broader theoretical talks about code-switching as a key site of identity formation and social practice in transnational, multicultural contexts. This work advances our understanding of bilingual language use in diverse social spaces.

We anchor this study’s theoretical core in the evolving trajectory of indexicality, beginning with Charles Sanders Peirce’s foundational semiotic framework that first sorted signs into three distinct categories: icons, symbols, and indices. Peirce defined indices as signs that derive their core meaning through direct existential or causal links to the entities they refer to—such as a weather vane that clearly signals current wind direction—rather than the visual or conceptual resemblance that frames icon function or the arbitrary, socially agreed-upon rules behind symbol meaning. This early formulation laid basic ground for context-dependent signification, but it lacked utility for analyzing multilingual community discourse. Silverstein reframed indexicality as a layered, dynamically shifting system that split the concept into two distinct types: default indexicality and non-localized dynamic indexicality. Default indexicality encompasses stable, culturally sedimented associations that bind a particular linguistic form to a specific social category, a connection visible across many U.S. southern border regions in the widespread linkage of Spanish to Mexican-American ethnic identity. Non-localized dynamic indexicality takes shape in real time, as speakers strategically deploy specific linguistic forms to negotiate shifting social meanings within narrow, context-specific interactions; code-switching here acts not just as a mirror of pre-existing identity, but as a practice that builds and reshapes social positions as conversations unfold. These two interrelated types together form a layered, hierarchical model of indexical meaning in social discourse.

Within this hierarchical model, code-switching—the practice of alternating two or more linguistic varieties in a single conversational turn—acts as a complex indexical sign that escapes rigid static social labeling. In multilingual spaces like those of Mexican-American teenagers, code-switching carries no fixed, universal meaning; a teen switching from English to Spanish mid-sentence might signal solidarity with a peer in a casual school hallway, but the same switch in a parent-teacher meeting could show deference or assert ethnic identity to push back against monolingual norms. This sharp, context-dependent flexibility makes code-switching a particularly rich object of sociolinguistic study. We observe that its indexical value shifts constantly, shaped by the unspoken dynamics of each specific interaction and the immediate needs of those involved in the conversation.

Most sociolinguistic scholarship on code-switching has centered on ties between language alternation and identity construction, with key studies tracking how speakers signal membership in ethnic, age, or class groups. Early research from scholars like Penelope Eckert showed that code-switching among adolescent peer groups acts to mark social boundary lines, clearly separating group insiders from external outsiders, while later work by Ana Celia Zentella highlighted how Mexican-American women use Spanish-English switching to navigate overlapping family, ethnic, and gender identity demands. But almost all these existing studies limit their focus to single, isolated interactional settings like home or school. This narrow, setting-specific focus leaves a critical gap in current understanding, as it fails to compare how code-switching practices shift across distinct social spaces. By centering a comparative semiotic analysis of Mexican-American teen discourse across multiple distinct, everyday settings, we fill that critical oversight, building on prior theoretical and empirical findings to unpack the subtle, context-bound indexicality of code-switching as a practice that both reflects and reshapes social identity in real time.

We construct this study’s corpus through a series of tight, ethically sound steps including participant selection, unobtrusive data collection, and systematic coding, all specifically designed to capture authentic code-switching practices that unfold in Mexican-American teens’ daily home and community interactions. We pick research participants using strict rules to match the study’s focus on language dynamics across generations and between peers: eligible teens are 13 to 18 years old, Mexican-American with first-generation Mexican immigrant parents, who use both English and Spanish daily at home and in their communities, and our final group has 24 people, split evenly by gender, with an average age of 15.6 years, all living their whole lives in Texas’s Rio Grande Valley—a dense Mexican-American community—balancing U.S. school exposure and Spanish-dominant home settings. This carefully chosen, demographically targeted sample gives us a solid foundation to explore how different social contexts naturally shape the teens’ language use patterns.

We put ethical rules first through every part of data collection, starting with a formal consent process where we get written approval from each teen’s legal guardian and verbal agreement from the teen, with clear notes on study goals, data storage, and withdrawal rights. We gather data through unobtrusive, non-participant natural observation, using high-quality digital voice recorders in out-of-the-way spots to capture spontaneous, unscripted interactions, targeting two settings to see how code-switching changes: peer groups, recorded during after-school gatherings at local community centers or teens’ homes over 4 to 6 weekly 90-minute sessions, and family interactions, recorded during daily routines like dinner prep or evening talks over 3 straight weekly 60-minute sessions, yielding 128 hours of audio for a robust, context-rich dataset. This large, context-diverse audio dataset gives us a solid foundation to explore nuanced code-switching patterns across varied social and domestic settings.

After collecting all data, we transcribe every audio material word-for-word into a standardized text corpus, following strict orthographic rules for both English and Spanish, including phonetic write-ups of non-standard speech features like Spanish lenition or English slang used by the participants. We sort the corpus along two linked lines: we tag code-switching behaviors using established sociolinguistic frameworks—marking three types: shifts within a single clause (“I need to comprar milk now”), between full clauses (“I finished my homework. Ahora voy a ver la televisión”), and single inserted phrases (“That’s so cool, ¿verdad?”)—while we label each utterance with its peer or family setting to compare patterns, with all transcriptions and tags checked twice by two trained linguists, their agreement rate topping 92% before finalizing the structured, analyzable dataset. This carefully structured, reliability-checked corpus gives us a clear framework to examine nuanced code-switching patterns in everyday Mexican-American teen discourse.

We draw on a classified corpus of 120 hours of recorded speech from 24 Mexican-American teenagers—12 male, 12 female—collected across a diverse set of peer and family interactional settings, to carry out a semiotic analysis of code-switching’s indexical meanings, unpacking both scenario-specific functions and broader cross-scenario patterns that shape its dynamic use in daily exchanges. In peer discourse, code-switching mostly points to shared Latino youth identity, in-group unity, and casual affective positions, acting as a semiotic tool to strengthen a sense of belonging while setting and regulating subtle social boundaries between group members and outsiders. During a group discussion of a local quinceañera, a 16-year-old female speaker shifted from English to Spanish mid-utterance: “We were supposed to meet at the park, pero María got stuck helping her abuela set up, so we bailed on the movie”; this switch points to shared cultural knowledge of intergenerational family obligations among peer in-group members, distinguishing those familiar with quinceañera traditions from outsiders who would miss the reference’s cultural specificity. This specific code-switch ties directly to in-group recognition and the subtle exclusion of those outside the cultural circle. Another instance involves a 17-year-old male speaker who used a Spanish slang term to frame a joke about school, uttering: “Mr. Henderson was tripping about the essay, but I just said ‘no manches, it’s only 500 words’”; here, the switch to “no manches” signals a relaxed, intimate peer dynamic, conveying a playful defiance that would feel stiff or overly formal if stated entirely in standard classroom English, while also marking the speaker as part of a Mexican-American youth subculture that regularly mixes linguistic repertoires to build connection. Family interactional settings bring an entirely distinct set of code-switching functions into play for these teenagers.

In family discourse, code-switching acts as a semiotic tool for intergenerational communication, cultural upkeep, and the negotiation of power hierarchies, as seen in a dinner-table conversation about college applications where a 15-year-old male speaker switched from English to Spanish to address his mother: “I’m worried about the cost, mamá, but the scholarship covers most of it—¿crees que papá me ayudará con el resto?”; this switch signals a desire for intimacy and respect, aligning with traditional Mexican norms of intergenerational deference, while ensuring his limited-English-proficient father follows the core of his request. Another case involves a 16-year-old female speaker who shifted from Spanish to English when explaining a social media trend to her younger sibling, using English for the technical term “TikTok trend” and social media metrics to ensure her sibling grasps the context-specific concept absent in her family’s traditional Spanish. This targeted switch bridges gaps between generational and cultural linguistic frames in the family unit.

A comparative look across peer and family scenarios shows code-switching carries both overlapping and distinct indexical functions, with shared uses tied to cultural identity but differing in their specific referents and pragmatic goals. Both settings use code-switching to signal shared cultural identity, but the identity referenced shifts: peer settings tie it to a hybrid Mexican-American youth subculture, while family settings link it to intergenerational ties to Mexican cultural traditions; peer discourse also has a higher rate of intra-utterance switching, 68% of total switches, compared to family discourse’s 42%, where switches are more often clause-bound and tied to specific pragmatic goals like address or clarification. Context dependence marks another key, measurable difference between the two interactional settings. Peer code-switching relies heavily on the presence of in-group members, with switches stopping or dropping off sharply when non-Latino peers join a conversation, while family code-switching stays consistent regardless of outside observers, as it’s tied to deep-rooted intergenerational norms and cultural practices. These measurable differences come from deeper social and cultural forces: peer talks revolve around youth subcultural identity building, where code-switching marks belonging and difference from outsiders, while family talks are shaped by intergenerational power dynamics and pressures to keep cultural ties amid immigrant assimilation. Code-switching’s indexical meanings shift constantly with the interactional spaces where these teens engage, reflecting the complex negotiation of identity, power, and cultural belonging in their adolescent lives.

For Mexican-American teenagers, code-switching acts as a shifting indexical system tied to two core uses—negotiating identity and marking social lines—both grown from the bicultural strains and adaptive moves of second-generation immigrant youth navigating U.S. sociocultural spaces, and it lets these teens work through the often clashing dual demands of "American" and "Mexican" cultural frames by activating context-specific meanings linked to each language. When talking to non-Latino American classmates, for instance, they might use mostly English with rare, carefully placed Spanish slang to show alignment with U.S. teen norms, while at family events or with first-generation Mexican immigrants, they switch to mostly Mexican Spanish with casual, familiar terms to signal ancestral ties. This careful shift helps them avoid the marginalization of being seen as "too American" or "too Mexican" in different circles. By tweaking how they switch languages to match who they’re talking to and the unwritten rules of each situation, these teens resolve the identity conflict tied to bicultural life by building a flexible, context-dependent dual identity instead of clinging to a fixed, single cultural label, a choice that helps them feel like they belong in multiple overlapping social worlds without being pushed to pick just one.

When it comes to marking social boundaries, code-switching acts as an indexical sign that draws flexible, adjustable lines instead of hard, exclusionary splits between different groups of people. In mixed-ethnic friend groups, Mexican-American teens might shift to quick, context-specific Spanish to show they’re part of a distinct Latino group, creating a bond with in-group members that sets them apart from non-Latino peers without blocking cross-group talk entirely, and they also use code-switching to mark the line between intimate family conversations—where Spanish ties to heritage, care, and intergenerational links—and public peer chats where English signals alignment with mainstream teen life. These boundaries aren’t set in stone; they shift and adapt based on the people involved and the situation at hand. A teen might switch to Spanish to explain a cultural idea to a curious non-Latino friend, or slip English slang into family talks to share parts of their U.S. teen life, keeping group ties strong while letting cross-group exchange happen.

When looked at through the wider lens of Mexican immigrant groups in the U.S., these indexical uses of code-switching lay bare the daily realities of second-generation youth living in a marginal social space, who sit between mainstream U.S. culture and the tight-knit immigrant community, so their code-switching isn’t random linguistic choice—it’s a strategic tool to claim a place in both worlds while pushing back against being labeled a "foreign" outsider or a "disconnected" American. These youth don’t switch languages by chance; each shift ties to a quiet push against the marginalization that comes from being caught between two distinct cultural spheres. This makes code-switching a clear window into their adaptive survival strategies. It captures the small, deliberate, context-aware language moves they make to work through structural inequality, cultural friction, and the sense of being pushed to the edges.

We ran a comparative semiotic analysis of code-switching in Mexican-American teen discourse, and found that this linguistic practice acts not just as a pragmatic communication tactic but as a layered indexical system that constructs, negotiates, and reinforces the complex social identities of the young people who use it; indexicality, as we define it here, is the capacity of linguistic forms to point to extra-linguistic social, cultural, and relational meanings, forming the core framework for unpacking why Spanish-English code-switching counts as a semiotic resource rather than a sign of weak linguistic ability. The core idea we use to guide our analysis is that each single instance of code-switching carries indexical links to specific social contexts, group affiliations, and emotional stances, meaning the choice to shift between languages is never random but a deliberate act of semiotic signaling. This framing shifts how we view non-monolingual speech in the social spaces where these teens interact.

We looked closely at natural conversational data from teen peer interactions, classroom sessions, and social media exchanges, and used this data to break down indexicality into three connected layers of meaning: macro-level links tie code-switching to broader cultural narratives of Mexican-American hybridity, pushing back against monolingual views that label non-standard speech as abnormal; meso-level signals mark group membership and unity, as teens switch languages to align with peer groups that value cultural authenticity while navigating English-dominated school spaces; micro-level uses carry fine-tuned emotional and relational cues, like shifting to Spanish for warm or frustrated remarks to show closeness, or to English for formal statements to maintain distance or comply with rules. This layered, context-focused breakdown shows that code-switching is a flexible, dynamic practice that adapts to the unique demands of each situation, letting teens work through multiple, often conflicting, identity positions all at once. Each language shift serves a specific, intentional purpose tied directly to the teen’s immediate social context.

The framework we’ve developed has practical uses beyond linguistic research, as it can inform educational policy, clinical linguistics work, and cross-cultural communication training; in schools, recognizing code-switching’s indexical function can help teachers move past deficit-based approaches that penalize non-monolingual speech, instead using it as a pedagogical tool to validate students’ cultural identities and bridge gaps between home and school language practices; in clinical settings, understanding these indexical links can help speech-language therapists distinguish between normative semiotic practice and actual linguistic impairment, avoiding misdiagnosis of bilingual youth. In professional spaces that regularly interact with Mexican-American communities, our analysis provides a solid base for building culturally aware communication strategies that respect the hidden indexical meanings embedded in code-switching. These tailored strategies help create more fair and effective interpersonal and institutional cross-group interactions.

By focusing on indexicality as our core analytical tool, our study adds to a growing body of research that reframes code-switching as a space of linguistic creativity and identity building, not a sign of linguistic confusion; it highlights that Mexican-American teen code-switching is a deliberate, rule-following semiotic practice that reflects the complex hybridity of their social worlds, shaped by both individual choice and larger structural forces. Future research can build on this framework by exploring how digital media platforms like TikTok and Instagram amplify or transform the indexical links tied to teen code-switching, as well as how intergenerational differences reflect shifting cultural narratives of Mexican-American identity. This analysis reinforces that linguistic diversity is a rich resource, not a barrier to effective communication.