variants:
or whistle-blower
plural whistleblowers or whistle-blowers
Definition of whistleblower
: one who reveals something covert or who informs against another
especially
: an employee who brings wrongdoing by an employer or by other employees to the attention of a government or law enforcement agency
Note: A whistleblower is commonly protected legally from retaliation.
I think whistleblowers play a hugely important role in countering the worst corporate and government excesses. — Damon Poeter … pledges to protect whistle-blowers who fear reprisals for their efforts. — Wall Street Journal Congress also added significant new protection for whistleblowers. The 1986 act provides remedies including reinstatement, back-pay with interest, and, as appropriate, punitive damages for whistleblowers who are discharged, demoted, or discriminated against due to involvement with a False Claims disclosure. — Bradford A. PenneyTest Your Vocabulary
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Merriam-Webster unabridged
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Time Traveler for whistleblower
The first known use of whistleblower was in 1906
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