Picture a basket of grain thrown up into the air. The heavy seed drops back down; the dry husks are so light that the wind simply takes them. Chaff is the half that blows away. Every other use keeps one of two things from that moment: the lightness of what floats off, or the judgement that it was not the part worth keeping.
可以想成一籃穀子被拋向空中。重的穀粒落回籃子，乾殼太輕，風一吹就走了。chaff 就是飛走的那一半。後面每一個用法，都留著這一幕裡的一樣東西：不是那種「輕飄飄、一撒就散」的感覺，就是那句「這不是要留的部分」的判斷。
From the word’s history
From Old English ceaf, related to Dutch kaf and German Kaff. The word has always named the husk itself; the other uses are pictures taken from it.
來自古英語 ċeaf，跟荷蘭文 kaf、德文 Kaff 同源。這個字從一開始就是「穀殼」本身，其餘的用法都是從這個畫面借出去的。
Wiktionary etymology supplied in packet (source_ref kaikki:3f6f69a190036ae4:868063155)
登入就可以看每一支怎麼連回核心畫面。