One way to hold this word: something a person has done so many times that it has settled in and become part of how they live. Not a decision made this morning — a groove worn smooth by repeating. When you meet wont, someone is pointing at an action and saying, quietly, "this one is not new; this one is how they always are."
From the word’s history
The source traces wont to Middle English wont, from Old English ġewunod, the past participle of ġewunian "to be accustomed to, to dwell" — the same family as German gewohnt and Dutch gewend. The old verb already joined being used to something with living in it.
資料來源記載 wont 來自中古英語 wont，再往前是古英語 ġewunod，也就是動詞 ġewunian（習慣於、居住）的過去分詞，與德語 gewohnt、荷蘭語 gewend 同源。那個古老的動詞本身就把「習慣」和「住下來」綁在一起，正好對上今天這個字的味道。
Wiktionary, "wont" (etymology 1)