stool pigeon

(sto̵̅o̅)

noun

noun

  1. a pigeon or other bird used as a decoy
  2. a person serving as a decoy
  3. Informal a spy or informer, esp. for the police
    also stoolie

    noun

See stool pigeon in American Heritage Dictionary 4

noun
  1. Slang A person acting as a decoy or as an informer, especially one who is a spy for the police.
  2. A pigeon used as a decoy.

Origin:

Origin: From the practice of tying decoy pigeons to a stool to attract other pigeons

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