stool pigeon

Noun
  1. Someone acting as an informer or decoy for the police (synset 110110781)
    is a type of: betrayer, blabber, informer, rat, squealer - one who reveals confidential information in return for money
    same as: canary, fink, sneak, sneaker, snitch, snitcher, stoolie, stoolpigeon
  2. A dummy pigeon used to decoy others (synset 104334248)
    is a 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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