[hwis-uhl-bloh-er, wis-]
a person who informs on another or makes public disclosure of corruption or wrongdoing.
Also, whistle blower.


whistle-blowing, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
informal a person who informs on someone or puts a stop to something

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Some of the journalists might not want to be a whistleblower, to expose the truth, if their personal safety is at stake.
She rose to office only after becoming a whistleblower against oil companies.
Whistleblower lost bonus as bosses plotted his firing.
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