ˈ ̷ ̷ˌ ̷ ̷ noun
Usage: often attributive
Etymology: Middle English, from wind (I) + fall
1.
a. : something that is blown down by the wind: as
(1) : a tree knocked down by the wind
(2) : fruit blown off a tree
b. : an instance of being blown down by the wind
excessive windfall in the residual stands — W.N.Sparhawk
c. : a tract where the trees have been blown down by the wind
2. : an unexpected or sudden gain or advantage
the decline in Atlantic fares may enable me to steal over one day if I get a windfall — H.J.Laski
detectives questioning neighbors … soon found themselves with a windfall of leads — E.D.Radin
all the windfall money received by housing promoters — Alvin Shuster