Definition of "supergrass" [supergrass]

• An informer providing substantial quantities of information on criminal or terrorist activities to the police. (noun)

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• "Anderson has been named by a "supergrass" convicted of conspiracy to murder who will give evidence next week. marcpen: A supergrass is a high level ex-gang member who 'turns Queen's Evidence' to become a prosecution witness."
• "The case is based around so-called supergrass evidence supplied by Newtownabbey brothers David Stewart (38) and Robert Stewart"
• "What are your views of the reports that Mohammed Siddique Khan met Mohammed Junaid Babar the key 'supergrass' prosecution witness in the current 'Operation Crevice' trial ?"