Definition

A "nark" is a person who tells on someone else to an authority figure. The secret they share may be small or significant, and the authority may be a parent, employer, police officer, etc. For example, a nark may be a boy who tells on his brother that he took an extra cookie, or a nark may be a politician who reveals a long-reaching blackmail scheme.

Origin

slang.net

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See “Nark” in Corporate Speak, Gen-Z Slang, Pirate Speak, and more.

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