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How does code-switching work between languages or dialects?

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Ferdinand de Saussure seated in a formal pose, wearing a dark suit with a vest and sporting a thick mustache, circa 1900. — Linguistics Much of the foundation of 20th-century sociolinguistics was created by the Swiss linguist Ferdinand de Saussure (1857–1913).

Code-switching is the process of shifting between different linguistic codes—such as languages or dialects—to suit a specific social context or conversational setting. Rather than being a sign of "poor grammar," this practice is a sophisticated linguistic tool used to navigate different cultural environments.1

Speakers often code-switch both consciously and unconsciously to align their speech or behavior with those around them. For example, an individual might use standard English in a professional setting while employing a vernacular dialect, such as African American Vernacular English, in informal or community settings.21

Sociolinguists note that this practice is vital for shaping and maintaining identity and a sense of belonging. While some outdated "correctionist" views have historically labeled the use of non-standard dialects as "broken," the "contrastivist" approach emphasizes that recognizing the grammatical differences between dialects allows speakers to effectively bridge their home language with the dominant national norm. Ultimately, code-switching reflects a speaker's ability to move fluidly across a continuum of social and cultural identities.1