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English definition of “supergrass”

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supergrass

noun [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, especially serious ones
(Definition of supergrass from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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