Stool pigeon

Pronunciation: /ˈstuɫ ˈpɪdʒən/

Stool pigeon (noun)

  1. A person who secretly gives information about criminals to the police or another authority.
  2. Someone who shares private information to harm or control others, often in a dishonest way.

Examples

  • The police questioned a stool pigeon about the robbery.
  • A stool pigeon gave details that led to the arrests.