supergrass

名词 n.
中文释义
英 /ˈs(j)uːpə(ɹ)ˌɡɹɑːs/   

英文释义

名词 n.
  1. An informer providing substantial quantities of information on criminal or terrorist activities to the police. UK,slang
    — I have to tell the hon. and learned Gentleman that I do not know the facts which led to that decision. On the other hand, although it is an unpleasant fact of life, there are now and again occasions on which, in order to achieve convictions against really bad villains, it is necessary to use people who are termed supergrasses.

词形变化

supergrasses plural

词源

From super- + grass, from grass (“an informer”).
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