One way to hold this word: you already walked out, the door is still there, and now you walk back in. The weight is not on going in — it is on this being the second time. Something always came before it: you left a job, a market, a piece of land, or the Earth's air. So the word carries a line that goes out and then comes back.
The source entry records the word as re- plus entry, that is, an entry that happens again.
來源資料記載這個字由 re-（再一次）加 entry（進入）組成，字面就是「再發生一次的進入」，正好對上它今天所有用法裡那個「第二次」的重點。
Wiktionary (kaikki extract) kaikki:3f6f69a190036ae4:1168118682:10888 — 'From re- + entry.'
From the picture
法律上把東西收回來
房東當初把房子交了出去，現在依照合約再走進來——一樣是「第二次進入」，只是這一次走進去代表把所有權拿回手上。
noun · C1
In law, the act of taking back property that you had let someone else use or live in, usually because that person has broken the agreement, for example by not paying rent.
（法律）收回占有
noun · B2
The act of going into a place again, or of starting to take part in something again after a period away from it, such as a job market, a school, or public life.
重返；再進入
noun · B2
The part of a flight in which a spacecraft, capsule, or satellite comes back into the Earth's atmosphere from space, when the air rushing past makes the outside extremely hot.
（太空船）返回大氣層