| 1. | a pigeon used as a decoy. |
| 2. | Also called stool⋅ie [stoo-lee] , stooly. Slang. a person employed or acting as a decoy or informer, esp. for the police. |

An informer, especially for the police: “Lefty figured out that Mugsy was the stool pigeon when he saw him talking to the warden.”
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stool (pigeon)
[ˈstul ˈpɪdʒən] and [ˈstuli] and stoolie
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| stoolie stool pigeon |