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Longman Dictionary of Contemporary English
whistle-blower
noun
EXAMPLES FROM CORPUS
▪ One of the most moving stories, he says in an interview, is that of a young whistle-blower.
▪ Perhaps he was viewed less as a courageous whistle-blower than as an irritating gad-fly.
▪ The tendency of bureaucrats to take a dim view of whistle-blowers is particularly marked in the military.
▪ What is disturbing is that it is typical of a new intolerance against whistle-blowers that raises serious questions about free speech.
Wiktionary
whistle-blower

n. (context idiomatic English) One who reports a problem or violation to the authorities; especially, an employee or former employee who reports a violation by an employer.''

WordNet
whistle-blower

n. an informant who exposes wrongdoing within an organization in the hope of stopping it; "the law gives little protection to whistleblowers who feel the public has a right to know what is going on"; "the whistleblower was fired for exposing the conditions in mental hospitals" [syn: whistle blower, whistleblower]

Usage examples of "whistle-blower".

The first target was Lieutenant Commander Phist, a whistle-blower who had blown the whistle on a billion dollar cost overrun, whose Navy career had of course been destroyed by his honesty.

Back when the world's most famous whistle-blower produced tapes proving the president of the United States had committed a slew of felonies, the Left was somewhat muted in its enthusiasm for female truth-tellers.

Also, any event like this one attracted all sorts of conspiracy theories and minority reports, offered by whistle-blower clubs, accountability hobbyists, solitary paranoiacs, autonomous whatif agents or wandering yesbut avatars.

While purporting to be a law-enforcement body independent of the legislative and executive branches, in reality it is little more than a political tool utilized by corrupt leaders to cover up high crimes and intimidate and imprison whistle-blowers.

It was very like a patronage plum, because the Tyrant was known to favor whistle-blowers and Hispanics, and the prior management of the company was not particularly pleased.

Ignoring the warnings of a few intrepid whistle-blowers, top management kept assigning Blair to bigger stories in new departments without alerting the editors to Blair's history, because - as Raines said - it would "stigmatize" him.

Furthermore, when a supposedly corrupt wrestler faced an opponent whom the whistle-blowers did not name as either corrupt or clean, the results were nearly as skewed as when two corrupt wrestlers met—suggesting that most wrestlers who weren’t specifically named were also corrupt.

Furthermore, when a supposedly corrupt wrestler faced an opponent whom the whistle-blowers did not name as either corrupt or clean, the results were nearly as skewed as when two corrupt wrestlers met--suggesting that most wrestlers who weren't specifically named were also corrupt.