I. narc1 /nɑːk $ nɑːrk/
noun [countable] American English informal[
Date: 1900-2000;
Origin: narcotic agent]
a police officer who deals with the problem of illegal drugs
[TahlilGaran] Dictionary of Contemporary English ▲
II. narc2 verb [intransitive + on] American English informal[
Date: 1800-1900;
Language: Romany;
Origin: nak 'nose']
to secretly tell the police about someone else’s criminal activities, especially activities involving illegal drugs
[TahlilGaran] Dictionary of Contemporary English ▲