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supergrass
noun [C] /ˈsuː.pə.ɡrɑːs/
/-pɚ.ɡræs/ UKDefinition
› 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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