a hero who comes to the rescue.
a beleaguered champion who fights heroically for a cause, as in politics.
Informal. a company that comes to the rescue of another, as to prevent a takeover.
From POTUS To FLOTUS: A Full (White) House Of AcronymsThe faster we move, the more abbreviations and assorted acronyms we use, and when it comes to talking about the folks who reside at 1600 Pennsylvania Avenue—otherwise known as the White House—there are plenty of acronyms to choose from.
Origin of white knight
First recorded in 1890–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for white knight
Still, the white-knight syndrome is deeply embedded in the Republican psyche.Why Republicans Need to Get Over the Idea of Jeb Bush in 2012|Howard Kurtz|March 2, 2012|DAILY BEAST
British Dictionary definitions for white knight
a champion or rescuer, esp a person or organization that rescues a company from financial difficulties, an unwelcome takeover bid, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012