Definition of black knight in English:

black knight

Line breaks: black knight

noun

Stock Exchange
A person or company making an unwelcome takeover bid for another company.
More example sentences
  • 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.

Origin

by association with white knight.

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