a government agent or detective charged with the enforcement of laws restricting the use of narcotics.
detective, force, man, policewoman, constable, police, patrolman, officer, blabbermouth, double-crosser, turncoat, sneak, squealer, source, fink, stoolie, betrayer, tattler, tattletale, informant
Origin of narc
1965–70, Americanism; shortening of narcotic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
US slang a narcotics agent
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
1967 (earlier narco, 1960), American English slang, shortened form of narcotics agent. Had been used 1955 for narcotics hospital, 1958 for narcotics addict. Sense and spelling tending to merge with older but unrelated nark (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper