- a pigeon or other bird used as a decoy
- a person serving as a decoy
- Informal a spy or informer, esp. for the policealso stoolie
- Slang A person acting as a decoy or as an informer, especially one who is a spy for the police.
- A pigeon used as a decoy.
Origin of stool pigeonFrom the practice of tying decoy pigeons to a stool to attract other pigeons.
(plural stool pigeons)