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Stool pigeon
noun – A person who provides information about another's wrongdoing.
Usage example: the FBI finally got a break when one of the mob boss's top henchmen turned stool pigeon
Tattletale is a synonym for
stool pigeon in
knowledge topic. In some cases you can use "Tattletale" instead a
noun phrase "Stool pigeon", when it comes to topics like informer to police.
popular alternative