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White knight

noun, verb, slang

Noun

1
An individual or corporation that intends to acquire another company in order to avert a hostile takeover.
"Forget about one possible white knight for Potash. Vale, the big Brazilian mining company, denied on Monday afternoon that it was in talks to acquire the giant Canadian fertilizer company."
2
a company that is a friendly acquirer in a takeover wordnet
3
A hero, savior, or righteous individual.
4
Someone who unnecessarily defends someone else. derogatory, figuratively
"After hearing her version of events, Lt. Wright assumed the role of white knight. He demanded that she file a formal complaint. She demurred, so the next day, over her objection, he alerted the academy."
5
Someone who unnecessarily defends someone else.; A man who defends a woman in debate etc. in an attempt to gain her favour. Internet, derogatory, figuratively, informal

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6
A mushroom of species Tricholoma album.
7
Used other than figuratively or idiomatically: see white, knight.
"The white knight is attacking the pawn on e4."

Verb

1
To unnecessarily defend someone, especially in an attempt to gain favour. derogatory, figuratively

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