Originally posted by Archaic
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Just to add a bit of detail to Dave's earlier answer, a "supergrass" is someone who has been himself involved in criminal activity, but who "turns Queen's evidence" (i.e. agrees to give evidence for the prosecution) in the hope of a reduced sentence. I have seen it used by the UK press with reference to American mafiosi who testify against their former associates.
I can't speak for anyone else, but my own experience is that criminals use "grass" to describe an informer, whereas police officers refer to "snouts". Just to confuse matters somewhat, "snout" is prison slang for tobacco!
Regards, Bridewell.
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