Definition of supergrass in English:

supergrass

Line breaks: super|grass
Pronunciation: /ˈsuːpəɡrɑːs, ˈsjuː-/

Entry from British & World English dictionary

noun

British informal
A police informer who implicates a large number of people: both turned supergrass and were the main prosecution witnesses

Definition of supergrass in:

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Word of the day flippant
Pronunciation: ˈflipənt
adjective
not showing a serious or respectful attitude