whistleblower

noun

whis·​tle·​blow·​er ˈ(h)wi-səl-ˌblō-ər 

variants or whistle-blower

plural whistleblowers or whistle-blowers

: 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. Penney

whistleblowing

ˈ(h)wi-səl-ˌblō-iŋ 

adjective

or whistle-blowing

a whistleblowing report

Many states have already enacted laws that protect whistle-blowing employees from retaliation.

—Greg Critser

whistleblowing noun

or whistle-blowing

… a National Security Agency agent who got in trouble for whistle-blowing.

—Renée Camus

Examples of whistleblower in a Sentence

There are laws to protect whistleblowers who reveal corporate malfeasance.

Recent Examples on the Web

Cybersecurity specialist Daniel Kellner (Josh O’Connor) decides to turn whistleblower upon discovering that the US government has been suppressing evidence of extra-terrrestrial life, as part of a cover-up that goes back decades. — Tom Bailey, Space.com, 9 Oct. 2026

Attorneys who represent officers that have sued the department over whistleblower retaliation dismiss the claim by Chief Jim McDonnell and others that some cops are exaggerating their claims in pursuit of a big payday. — Sean Greene, Los Angeles Times, 9 Oct. 2026

Meta has aggressively moved to silence another recent whistleblower, former public policy director Sarah Wynn-Williams, taking legal action to stop her from promoting her memoir about her time at the company, Careless People. — Lauren Feiner, The Verge, 9 Oct. 2026

Recently, she’s been working to support whistleblowers at AI companies. — Emma Hinchliffe, Fortune, 9 Oct. 2026

Word History

First Known Use

1906, in the meaning defined above

Rhymes for whistleblower

• blower
• goer
• grower
• jowar
• knower
• lower
• mower
• rower
• slower
• sower
• thrower

Legal Definition

whistleblower

noun

whis·​tle·​blow·​er

ˈhwi-səl-ˌblō-ər

: an employee who brings wrongdoing by an employer or other employees to the attention of a government or law enforcement agency and who is commonly vested by statute with rights and remedies for retaliation compare qui tam action

whistleblowing

-iŋ

noun