Definition of black knight in English:
A person or company making an unwelcome takeover bid for another company.
- The black knight, of course, isn't the type to court a maiden with flowers but instead prefers a fast horse and a sack.
- Comcast has opened the door for possible black knights to appear too, in the form of Viacom, Liberty Media or even Microsoft.
- A white knight is a person who is asked to acquire a company as an alternative to an unwanted black knight, who is the investor initiating a hostile takeover bid.
by association with white knight.