A compound word from wind + fall
#(countable) a fruit that has fallen from a tree naturally, as from wind
#:They couldn't reach the branches, so they ate the windfalls.
#(countable) a sudden large benefit; especially an influx of money
#*2004: w: Chris Wallace (journalist)|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.