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English definition of “nark”

nark

verb [I] (TELL POLICE)    /nɑːk/ US  /nɑːrk/ US slang
to secretly tell the police or someone in authority about something bad or illegal that someone has doneRevealing secrets and becoming known
(Definition of nark verb (TELL POLICE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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