English

Definition of stool pigeon noun from the Oxford Advanced Learner's Dictionary

 

stool pigeon

 noun
noun
BrE
 
; NAmE
 
(informal)
 
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a person, especially a criminal, who helps the police to catch another criminal, for example by spending time with them and getting secret information synonym informer Word Origin late 19th cent.: so named from the original use of a pigeon fixed to a stool as a decoy.
See the Oxford Advanced American Dictionary entry: stool pigeon