copper's nark

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Noun1.copper's nark - an informer or spy working for the police
Britain, Great Britain, U.K., UK, United Kingdom, United Kingdom of Great Britain and Northern Ireland - a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom
betrayer, blabber, informer, squealer, rat - one who reveals confidential information in return for money
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in classic literature ?
[Explaining to the note taker] She thought you was a copper's nark, sir.
THE NOTE TAKER [with quick interest] What's a copper's nark?
THE BYSTANDER [inept at definition] It's a--well, it's a copper's nark, as you might say.
It may be related to "nark", "informer" ("a copper's nark"), from the Romani "nak", "nose", but this is unclear.
Mainly because, for years, he played a copper's nark who read the Crimewatch autocue which made pensioners stay awake at night clutching a poker in one hand and their life savings in the other.
She has now become a sort of copper's nark, an "if you're innocent, what have you got to hide ?" type of Sun reader approach to identity cards, national DNA databases, and a microphones in every house approach to the security state.