# blow the whistle

idiom

Source: https://englishreference.com/idiom/blow-the-whistle
Updated: 2026-08-10

## Meaning

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.

## Examples

- The employee decided to blow the whistle on the company's illegal activities.
- After discovering that the factory was dumping waste into the river, the manager decided to blow the whistle to the local authorities.
- The nurse chose to blow the whistle after she noticed the hospital was ignoring safety rules to save money on equipment.
- Despite the threat of losing his pension, the accountant felt morally obligated to blow the whistle on the systemic fraud occurring within the corporation.

## Origin

Probably an allusion to the practice of a police officer blowing a whistle upon observing a violation of the law, the phrase entered the English lexicon as a metaphor for exposing illicit activity. The whistle served as a public signal that the rules of play, or the laws of the land, had been interrupted by a transgression. The literal action provided a convenient shorthand for the transition from quiet observation to formal intervention. (disputed)

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.