nounBritish • informal
- A police informer who implicates a large number of people: both turned supergrass and were the main prosecution witnessesMore example sentences
- Facing 25 years in jail, he transformed into a supergrass and implicated his accomplices in order to land himself a lighter sentence.
- The court distinguished him from a supergrass or informer by describing him as ‘a contracted and paid agent of the FBI’ and as ‘a witness under protection.’
- A drugs baron who turned supergrass to implicate his mother, wife, brother, lover and others was jailed for six years yesterday for smuggling £132m of cocaine and cannabis into Britain.