stool pigeon

Definitions of stool pigeon
1

n someone acting as an informer or decoy for the police

Synonyms:
canary, fink, sneak, sneaker, snitch, snitcher, stoolie, stoolpigeon
Type of:
betrayer, blabber, informer, rat, squealer
one who reveals confidential information in return for money

n a dummy pigeon used to decoy others

Type of:
bait, decoy, lure
something used to lure fish or other animals into danger so they can be trapped or killed

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