nark

IPA: nɑrk

(Britain, Ireland, slang) A police spy or informer.
(Australia, slang) An unpleasant person, especially one who makes things difficult for others.
Alternative form of narc (narcotics officer). [(informal, colloquial, drugs) A police officer or federal agent assigned to or engaging in illegal narcotics control.]

Examples of "nark" in Sentences

"The fear of being labelled a 'nark' … can stop prisoners from speaking up with that information."
A 'nark' is an informer, a spy among criminals who sells the police whatever information he can scrape up.
I looked out of the spy window in the back of the cab and saw my "nark" standing staring in the middle of the road.
A screaming match erupted in the Hamilton District Court yesterday as a man who went on a pokie-machine burglary spree in New Plymouth early this year was labelled a "nark".
Had Johnson been a "nark" of the police he would soon have been exposed, but as he dealt with cases which never came directly into the courts, his activities were never realized by his companions.
He had risen very rapidly, but from very dirty beginnings; being first a "nark" or informer, and then a money-lender: but as solicitor to the Eyres he had the sense, as I say, to keep technically straight until he was ready to deal the final blow.