Meaning of “supergrass” in the English Dictionary

british dictionary

"supergrass" in British English

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supergrassnoun [ C ]

uk /ˈsuː.pə.ɡrɑːs/ us /ˈsuː.pɚ.ɡræs/ UK

a person, especially a criminal, who gives the police a lot of information about the activities of criminals, especially serious ones

(Definition of “supergrass” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)