Definition of nark noun from the Oxford Advanced Learner's Dictionary

 

nark

 noun
noun
BrE BrE//nɑːk//
 
; NAmE NAmE//nɑːrk//
 
(British English, slang)
 
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a person who is friendly with criminals and who gives the police information about them Word Origin mid 19th cent.: from Romany nāk ‘nose’.