One way to hold this word: it names the hole at the very bottom of the body, the least part there is. Everything else it does is that same picture pointed somewhere new — at a person you have no respect left for, or at a place you would not want to spend an afternoon. Because the picture itself is dirty, the word stays heavy wherever it goes; the source marks it taboo and vulgar in every use.
From the word’s history
The word is arse plus hole, written arce-hoole in Middle English; Old English had ears-þyrel, literally the same two parts. So the body meaning is where the word starts, and both of the other uses are that image aimed at something new.
這個字就是 arse（屁股）加 hole（洞），中古英語寫成 arce-hoole；古英語的 ears-þyrel 字面也一樣。所以身體的意思是起點，罵人和罵地方都是把那個畫面搬過去用。
Wiktionary entry supplied in this packet (kaikki:3f6f69a190036ae4:491670402): From Middle English arce-hoole, equivalent to arse + hole; compare Old English ears-þyrel.
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