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general::
Phrase(s): blow the whistle (on someone)
1. Fig. to report someone’s wrongdoing to someone (such as the police) who can stop the wrongdoing. (Alludes to blowing a whistle to attract the police.) • The citizens’ group blew the whistle on the street gangs by calling the police. • The gangs were getting very bad. It was definitely time to blow the whistle. 2. Fig. to report legal or regulatory wrongdoing of a company, especially one’s employer, to authorities. • She was fired for blowing the whistle on the bank’s mismanagement of accounts, but she then sued the bank.
McGrawhill's American Idioms And Phrasal Verbs