The structure is a clipped shortening of "narcotics officer," dropping the final syllables to create a quicker, more casual noun. It is used to describe a police officer or federal agent working on illegal narcotics control, often one who investigates, arrests, or infiltrates drug operations. People typically use "narc" as a neutral descriptor in news or police contexts, but in street slang it carries a negative or fearful tone, as in "Watch out, that guy's a narc."

What does "narc" mean in law enforcement and street slang?

Définition et signification de « narc » en anglais

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