supergrass Meaning in the Cambridge English Dictionary
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Meaning of “supergrass” in the English Dictionary

"supergrass" in British English

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supergrassnoun [C]

uk   /ˈsuː.pə.ɡrɑːs/  us   /-pɚ.ɡræs/ UK
a ​person, ​especially a ​criminal, who gives the ​police a lot of ​information about the ​activities of ​criminals, ​especiallyseriousones
(Definition of supergrass from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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