simple past tense and past participle of nark

(Britain, slang) A police spy or informer. / (Australia, slang) An unpleasant person, especially one who makes things difficult for others.

(transitive, thieves' cant) To watch; to observe. / (intransitive, slang) To serve or behave as a spy or informer. / (transitive, slang) To annoy or irritate. / (intransitive, slang) To complain.

Alternative form of narc (narcotics officer).

present participle of nark

That narks or annoys; annoying.

(colloquial) Nitrogen narcosis.

plural of nark

Third-person singular simple present indicative form of nark