Definition of black swan in English:

black swan

Pronunciation /ˌblak ˈswän/ /ˌblæk ˈswɑn/

noun

  • 1A mainly black swan with white flight feathers which is common in Australia and Tasmania and has been introduced elsewhere.

    Cygnus atratus, family Anatidae

  • 2An unpredictable or unforeseen event, typically one with extreme consequences.

    ‘the bank industry's vulnerability to black swans’
    • ‘black swan events always look eminently predictable in hindsight, yet no one ever predicts them’
  • 3Something extremely rare.

    • ‘husbands without faults, if such black swans there be’