From Longman Dictionary of Contemporary Englishwhistle-blowerˈwhistle-ˌblower noun [countable] TELLsomeone who tells people in authority or the public about dishonest or illegal practices at the place where they work —whistle-blowing noun [uncountable]
Examples from the Corpus
whistle-blower• What is disturbing is that it is typical of a new intolerance against whistle-blowers that raises serious questions about free speech.• 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.• One of the most moving stories, he says in an interview, is that of a young whistle-blower. 