Definitions
1.NounA police spy or informer.
2.NounAn unpleasant person, especially one who makes things difficult for others.
3.VerbTo serve or behave as a spy or informer; to tattle."“If you nark on me, I’ll rip your arms off,” said Tim to his brother, as he passed him a joint.; I don’t trust that guy; he’s gonna nark us out."
4.VerbTo annoy or irritate."It really narks me when people smoke in restaurants."
5.VerbTo complain."He narks in my ear all day, moaning about his problems."
6.VerbTo stop."Nark it! I hear someone coming!"
7.NounAlternative form of narc (narcotics officer).