Noun

1. Something that has been blown down by the wind.
2. A fruit that has fallen from a tree naturally, as from wind

   They couldn't reach the branches, so they ate the windfalls.

3. a sudden large benefit; especially an influx of money
   • 2004: Chris Wallace, Character: Profiles in Presidential Courage

     Businessmen rushed to get every last commodity aboard a departing ship, hoping for a windfall once the world realized these would be the very last sacks of flour available, thus driving up prices.