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.
权威例句
1. And the government enjoyed a windfall from selling our warrants.
政府从出售我们的认股证书中发了一大笔意外之财.
2. I had a windfall from the football pools.
我从足球比赛赌博中发了一笔横财.
3. The windfall allowed me to buy a house.
这意外之财使我得以购置一幢房子.
4. The water treatment was new, now , and Tom's low condition was a windfall to her.
时下,水疗法是个新玩意, 正巧汤姆精神也不怎么样,这下可得了她的劲.
5. They may try to spread out the enjoyment of the windfall over many years.