Etymology
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windfall (n.)

mid-15c., from wind (n.1) + fall (n.1). Originally literal, in reference to wood or fruit blown down by the wind, and thus free to all. Figurative sense of "unexpected acquisition" is recorded from 1540s.

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Definitions of windfall

windfall (n.)
fruit that has fallen from the tree;
windfall (n.)
a sudden happening that brings good fortune (as a sudden opportunity to make money);
Synonyms: boom / bonanza / gold rush / gravy / godsend / manna from heaven / bunce
From wordnet.princeton.edu