Meanings
When used idiomatically, probably an allusion to a police officer blowing his or her whistle on observing a violation of the law.
How to pronounce "blow the whistle":
AU
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.
To make a piercing sound which signals a referee's action or the end of a game.
Example Sentences
1
She decided to blow the whistle on her boss's illegal activities.
2
The employee did not want to blow the whistle on his colleagues, but felt it was the right thing to do.
3
He knew he would face consequences, but he still chose to blow the whistle on the cover-up.
4
The witness finally decided to blow the whistle and testify against the criminals.
