Etymology
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stool pigeon (n.)

"police informer," 1859, American English; earlier "one who betrays the unwary (or is used to betray them)," 1821, originally a decoy bird (1812); said to be from decoys being fastened to stools to lure other pigeons. But perhaps related to stall "decoy bird" (c. 1500), especially "a pigeon used to entice a hawk into the net" (see stall (n.2)). Also see pigeon.

updated on April 06, 2014

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Definitions of stool pigeon from WordNet

stool pigeon (n.)
someone acting as an informer or decoy for the police;
Synonyms: fink / snitch / snitcher / stoolpigeon / stoolie / sneak / sneaker / canary
stool pigeon (n.)
a dummy pigeon used to decoy others;
From wordnet.princeton.edu, not affiliated with etymonline.

Dictionary entries near stool pigeon

stonework

stony

stood

stooge

stool

stool pigeon

stool-ball

stoop

stop

stop-and-go

stope