Blow the whistle

verb

Definitions

Verb
  1. 1
    To disclose information to the public or to appropriate authorities concerning the illegal or socially harmful actions of a person or group, especially a corporation or government agency. idiomatic, usually

    "In some jurisdictions, it is illegal to fire a person for blowing the whistle on an employer."

  2. 2
    To make a piercing sound which signals a referee's action or the end of a game.

Etymology

When used idiomatically, probably an allusion to a police officer blowing his or her whistle on observing a violation of the law.

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