stool pigeon

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stool pigeon

1. a living or dummy pigeon used to decoy others
2. an informer for the police; nark
References in periodicals archive ?
Younger, sexier, better track record, more Because, unlike stool pigeons, I've yet to see one shamelessly pecking the badge.
Brushed with chiaroscuro textures by Peter Kaczorowski's brooding lighting, John Lee Beatty's quietly oppressive set is an atmospheric representation of an all-seeing community with rigid rules--particularly regarding stool pigeons.
Operators mixed up the Wehrmacht and Luftwaffe officers, provided stool pigeons and even set up an undercover interpreter.