n. someone who calls a halt to something; an informer; an enforcer; a stool (pigeon). : I don't know who the whistle-blower was, but a good time was really ruined.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Example sentences
She never wanted to be identified as a whistle-blower.