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narc

or nark

[nahrk]
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noun Slang.
  1. a government agent or detective charged with the enforcement of laws restricting the use of narcotics.
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Origin of narc

1965–70, Americanism; shortening of narcotic

narc-

  1. variant of narco- before a vowel: narcoma.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for narc

narc

noun
  1. US slang a narcotics agent
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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

Word Origin and History for narc

n.

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.).

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Online Etymology Dictionary, © 2010 Douglas Harper