a person who gives information to the police or other authority （向警方或其他当局的）告密者；线人 The bomber turned (= became) police informer to escape prison. 轰炸机转身成为警察线人以逃离监狱。 One of the gang members had turned informer. 一个团伙成员后来变成了告密者。
Oxford Collocations Dictionaryadjective- police
- become
- turn
- a network of informers