white knight
noun
RareNot in standard dictionaries
1
An individual or corporation that intends to acquire another company in order to avert a hostile takeover.
2
A hero, savior, or righteous individual.
3
Someone who unnecessarily defends someone else.
4
A man who defends a woman in debate etc. in an attempt to gain her favour.
5
A mushroom of species Tricholoma album.
6
Used other than figuratively or idiomatically: see white, knight.
Thesaurus
#derogatory#informal#internet