white knight noun 5verb 1forms 6 noun5 •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. — 2010 •A hero, savior, or righteous individual. •(disapproving, figurative) Someone who unnecessarily defends someone else. •(disapproving, figurative) A man who defends a woman in debate etc. in an attempt to gain her favour. •A mushroom of species Tricholoma album. verb1 •(disapproving, figurative) To unnecessarily defend someone, especially in an attempt to gain favour. formswhite knighted · white-knighted · white knighting · white-knighting · white knights · white-knights