Definition of stool pigeon
1
: a person acting as a decoy or informer
especially
: a spy sent into a group to report (as to the police) on its activities
2
: a pigeon used as a decoy to draw others within a net
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Merriam-Webster unabridged
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Time Traveler for stool pigeon
The first known use of stool pigeon was in 1826
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