Definition of supergrass noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈsuːpəɡrɑːs//
, BrE//ˈsjuːpəɡrɑːs//
; NAmE NAmE//ˈsuːpərɡræs//
(British English, informal) Solving crime
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a criminal who informs the police about the activities of a large number of other criminals, usually in order to get a less severe punishment compare grass See related entries: Solving crime