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white knight

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noun
  1. a hero who comes to the rescue.
  2. a beleaguered champion who fights heroically for a cause, as in politics.
  3. Informal. a company that comes to the rescue of another, as to prevent a takeover.
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Origin of white knight

First recorded in 1890–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for white knight

white knight

noun
  1. a champion or rescuer, esp a person or organization that rescues a company from financial difficulties, an unwelcome takeover bid, etc
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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