blow the whistle on

blow the whistle (on) (someone or something)

To expose or report something scandalous or deceptive. That company's stock price plummeted after the media blew the whistle on the CEO's embezzlement scandal. If you keep coming in late, I'm going to have to blow the whistle and report you to the department head.See also: blow, whistle

blow the whistle on

1. Expose corruption or other wrongdoing, as in The President's speech blew the whistle on the opposition's leaking information. [Colloquial; 1930s] 2. Put a stop to, as in The registry decided to blow the whistle on new vanity plates. The term originally alluded to ending an activity (such as factory work) with the blast of a whistle. [Late 1800s] See also: blow, on, whistle

blow the whistle on

bring an illicit activity to and end by informing on the person responsible. informal This idiom comes from football, in which the referee blows a whistle to indicate that a player has broken the rules. Those who inform on others engaged in an illicit activity are now referred to as whistle-blowers .See also: blow, on, whistle