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.).
(also narc): He will nark on him if the first guy doesn't keep playing games/ felt the Fraynes and their youngsters had narced on them
[fr Romany nak, ''nose'']
: down to the narco police on the beat
A narcotics agent or police officer; gazer: another drug-scare hoax promulgated by the ''narcs''/ the ritual of dodging the ''narcos'' (1960s+ Narcotics)