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.

updated on March 26, 2014

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Definitions of windfall from WordNet

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, not affiliated with etymonline.