supergrass

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supergrass /ˈsuːpɚˌgræs/ Brit /ˈsuːpəˌgrɑːs/ noun
plural supergrasses
supergrass
/ˈsuːpɚˌgræs/ Brit /ˈsuːpəˌgrɑːs/
noun
plural supergrasses
Learner's definition of SUPERGRASS
[count] British, informal
: a criminal who gives information to the police about a large number of other criminals
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