Whistle-blower

Origin

Probably an allusion to a police officer blowing his or her whistle on observing a violation of the law.

Full definition of whistle-blower

Noun

1. (idiomatic) One who reports a problem or violation to the authorities; especially, an employee or former employee who reports a violation by an employer.''We owe it to a small group of brave whistle-blowers that we know about the infractions at all.

Synonyms

Related terms

• whistleblowing