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

Synonyms

• betrayer
• canary [slang]
• deep throat
• fink
• informant
• informer
• nark [British]
• rat
• rat fink
• snitch
• snitcher
• squealer
• stool pigeon
• stoolie
• talebearer
• tattler
• tattletale
• telltale

Examples of whistleblower in a Sentence

There are laws to protect whistleblowers who reveal corporate malfeasance.

Recent Examples on the Web

According to the Journal, an anonymous whistleblower penned a letter to the board – which includes former Vice President Al Gore, Jordan's Queen Rania and European Central Bank President Christine Lagarde as members – alleging financial and ethical misconduct by Schwab and his wife, Hilde. —Danielle Wallace, FOXNews.com, 24 Apr. 2025

The lawmakers, who are part of the Congressional Labor Caucus, wrote the letter in light of news first reported by NPR, that a whistleblower inside the IT Department of the NLRB says DOGE may have removed sensitive labor data and exposed NLRB systems to being compromised. —Jenna McLaughlin, NPR, 24 Apr. 2025

Just days after being promoted to acting IRS commissioner, the whistleblower who testified publicly about investigations into Hunter Biden’s taxes is out again, according to three people familiar with the decision. —Fatima Hussein and Chris Megerian, Los Angeles Times, 18 Apr. 2025

Related Articles Trump turns a COVID information website into a promotion page for the lab leak theory IRS whistleblower on Hunter Biden is out as acting commissioner just days after getting the job Video shows doctor with measles treating kids. —Kff Health News, Oc Register, 18 Apr. 2025

Word History

First Known Use

1906, in the meaning defined above

Rhymes for whistleblower

• blower
• goer
• grower
• 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