informer

🇬🇧/ɪnˈfɔːmə(r)/ 🇺🇸/ɪnˈfɔːrmər/📚 18152 11 1GRE
An informer is a person who tells the police that someone has done something illegal. 告密者

noun [专属名词]告密者;通知者;控告人

One of the gang members had turned informer.
团伙中的一员后来变成了告密者。

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