windfalln.
英 'wɪn(d)fɔːl | 美 'wɪndfɔl
中文n. 意外之财；被风吹落的果子；意外的收获
词根词源
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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