Definition of windfall noun from the Oxford Advanced American Dictionary

     

    windfall

     noun
    noun
    NAmE//ˈwɪndfɔl//
     
     
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  1. 1 an amount of money that someone or something wins or receives unexpectedly The hospital got a sudden windfall of $900,000. windfall profits The government imposed a windfall tax (= a tax on profits to be paid once only, not every year) on some industries.
  2. 2 a fruit, especially an apple, that the wind has blown down from a tree The ground was covered with windfalls.
See the Oxford Advanced Learner's Dictionary entry: windfall