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Definition of Blow the whistle
1. Verb. (idiomatic usually with "on") 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. ¹
2. Verb. (context: team sports) To make a piercing sound which signals a referee's action or the end of a game. ¹
¹ Source: wiktionary.com