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English definition of “supergrass”

supergrass

noun [C]   /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 onesPeople who reveal secrets and tell tales
(Definition of supergrass noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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