noun
(UK, Ireland) A police spy or informer.
(Australia) An unpleasant person, especially one who makes things difficult for others.
verb
(transitive, intransitive, slang) To serve or behave as a spy or informer; to tattle.
(transitive, slang) To annoy or irritate.
(intransitive, slang) To complain.
(transitive, slang, often imperative) To stop.
noun
Alternative form of narc (narcotics officer).