To tell the police or a boss that someone did something wrong.
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To report serious wrongdoing to the authorities.
When you blow the whistle, you tell the police or the press about something illegal that others wanted hidden.
It usually comes at a personal cost, which is why it counts as an act of conscience.
"Spill the Beans"
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Reveal a secret, often accidentally
"Throw Someone Under the Bus"
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Blame someone to save yourself
"Blow the Whistle on Someone"
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Report bad behavior to authorities