Stool pigeon Meaning, Definition & Usage

  1. noun someone acting as an informer or decoy for the police
    sneaker; canary; sneak; stoolpigeon; fink; stoolie; snitch; snitcher.
  2. noun a dummy pigeon used to decoy others

WordNet


Definitions
  1. a pigeon used as a decoy to draw others within a net; hence, a person used as a decoy for others.

Webster 1913