white knight🔊

(business) An individual or corporation that intends to acquire another company in order to avert a hostile takeover.

(fiction) A hero, savior, or righteous individual.

(derogatory) Someone who unnecessarily defends someone else.

(internet) A man who defends a woman in debate etc. in an attempt to gain her favour.

A mushroom of species (species).

(knight)

(derogatory) To unnecessarily defend someone, especially in an attempt to gain favour.