1859, "to act as a police informer" (v.); 1860, "police informer" (n.), probably from Romany nak "nose," from Hindi nak, from Skt. nakra, which probably is related to Skt. nasa "nose" (see nose). Sense and spelling tending to merge with unrelated narc (q.v.).
n. a police informer. : Fred is a nark. He squealed.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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