Definition of "nark" []

• Slang Variant of narc. (noun)
• An informer, especially a police informer. (noun)
• To be an informer. (verb-intransitive)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "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."
• "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."