Think of an orchard the morning after a windy night. Fruit is lying on the grass, ready to pick up. Nobody climbed, nobody waited for it to ripen, nobody worked for it — the wind did the work, and whoever happens to be standing there gets to keep it. That free thing on the ground is the picture the word carries into all its uses.
可以想成一夜大風之後的果樹下。地上躺著一堆果子，彎腰就撿得到。沒有人爬樹，沒有人等它熟，是風替你做完了。誰剛好站在那裡，誰就撿得到。這個「不必出力、剛好輪到你」的畫面，一直留在這個字裡。
From the word’s history
Formed from wind + fall, recorded in Middle English as windfal: literally the thing the wind brought down.
這個字由 wind（風）加 fall（落下）組成，中古英語寫作 windfal，字面就是「被風吹下來的東西」。組成的兩個字都還看得出來，所以樹下的果子這個畫面很容易對上。
Wiktionary entry supplied in this packet (kaikki:3f6f69a190036ae4:899045061): From Middle English windfal, wyndfall, equivalent to wind + fall.
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