
What Does “stool pigeon” mean?
Definition:
A decoy or an informer, especially one who is a spy for the police.
Example(s)
He was killed by a gangster because he was thought to be a stool pigeon.
This idiom is in the crime category.
  
A decoy or an informer, especially one who is a spy for the police.
He was killed by a gangster because he was thought to be a stool pigeon.
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