stool pigeon

Definitions of stool pigeon
  1. noun
    someone acting as an informer or decoy for the police
    synonyms: canary, fink, sneak, sneaker, snitch, snitcher, stoolie, stoolpigeon
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    type of:
    betrayer, blabber, informer, rat, squealer
    one who reveals confidential information in return for money
  2. noun
    a dummy pigeon used to decoy others
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    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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