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English definition of “nark”

nark

noun [C] (CRIMINAL)    /nɑːk/ US  /nɑːrk/ UK old-fashioned slang
a person, especially a criminal, who gives the police information about other criminals: a coppers' narkPeople who reveal secrets and tell talesMiscellaneous criminals
(Definition of nark noun (CRIMINAL) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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