Definition of black knight in English:

black knight

noun

Stock Market
  • A person or company making an unwelcome takeover bid for another company.

    • ‘With a black knight, the only thing you know they follow is the clink of coins…’
    • ‘The black knight, of course, isn't the type to court a maiden with flowers but instead prefers a fast horse and a sack.’
    • ‘For 17 years, the media has made me the black knight, the scapegoat.’
    • ‘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.’
    • ‘Comcast has opened the door for possible black knights to appear too, in the form of Viacom, Liberty Media or even Microsoft.’

Origin

By association with white knight.

Pronunciation

black knight