A way to hold this word: something has been pulled away from where it used to sit, and someone is holding it there. Let go, and it slides back. Reversion is the name of that slide back — not the letting go, and not the place, but the going-back itself. What slides can be a habit, a rule, a name, or a field of land; the picture does not change, only the thing in it.
The supplied entry takes reversion from Latin reversio, from reverto — re-, back, plus verto, turn. Read through English parts it is revert + -sion, the noun of the turning back. The slide-back picture is the word's own shape.
來源說 reversion 出自拉丁文 reversiō，背後是 revertō：re-（回）加上 vertō（轉）。用英文的零件看就是 revert 加上 -sion，把「轉回去」變成一個名詞。這個滑回去的畫面，本來就長在字的形狀裡。
Wiktionary entry for reversion (noun), source_ref kaikki:3f6f69a190036ae4:1122521473, supplied in this packet
From the picture
財產回到原主（法律）
同一個滑回去的畫面，只是把滑回去的那樣東西指定成財產。法律要的正是這種精準：先講清楚東西暫時交給誰、交多久，再講清楚時間一到它回到誰手上。
noun · C2
In law: the return of property to its earlier owner, or to that owner's family, when the time or the conditions of a grant, lease or gift have run out.
（法律）產權回歸
noun · C1
A going back to an earlier state, an earlier way of doing things, or an old habit.
回復；回到原樣