supergrass /ˈsuːpɚˌgræs/ Brit /ˈsuːpəˌgrɑːs/ noun plural supergrasses
/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向警方告密的罪犯