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.
In some jurisdictions, it is illegal to fire a person for blowing the whistle on an employer.
(team sports) To make a piercing sound which signals a referee's action or the end of a game.
Source: en.wiktionary.org⭐ After a cozy-ish little dinner in Oakville with Barbara, Jordan popped up in the hotel room of some guy who neglected to blow the whistle on his chemical company’s sketchy ways — practices that led to the poisoning of people such as Jordan’s wife. Source: Internet
A person is diligently tasked with the conundrum of choosing to be loyal to the company or to blow the whistle on the company’s wrongdoing. Source: Internet
As such, workers remain afraid to blow the whistle, in fear that they will not be believed or they have lost faith in believing that anything will happen if they do speak out. Source: Internet
If time expires while the ball is in play, the game continues until the ball is "dead", and only then will the referee blow the whistle to signal half-time or full-time; but if the referee awards a penalty or free-kick, the game continues. Source: Internet
Participants were schooled on corruption and its forms, and were also equipped to blow the whistle on corruption, and to work with the various anti-corruption agencies. Source: Internet
Plus, of course, that foolish culture of denial and cover-up by government and the cussing of people who blow the whistle. Source: Internet