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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
Informant is a synonym for
stool pigeon in
knowledge topic. You can use "Informant" instead a
noun phrase "Stool pigeon", if it concerns topics such as informer to police.
popular alternative