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supergrass

noun
🔊/ˈsuːpəɡrɑːs/
🔊/ˈsuːpərɡræs/
 (British English, informal)
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  1. a criminal who informs the police about the activities of a large number of other criminals, usually in order to get a less severe punishment（为求得宽大处理）向警方告密的罪犯 compare grassTopics Crime and punishmentc2