Meaning of stool pigeon | Babel Free

Definitions

1. A pigeon tied to a stool by a piece of twine, used as a decoy to entice free-flying birds to the ground to be shot or trapped.
2. A decoy used in a crooked gambling game.
   obsolete, slang
3. An informer to the authorities, especially one who gives up criminal associates.
   slang

Equivalents

CEFR level