Think of holding two magnets the wrong way round. Nothing touches them, but something between them pushes, and the closer you bring them the harder it pushes back. That steady push-apart is the picture inside this word, and every use of it is a version of that push: a force between objects, a surface keeping water off, or a body that wants to step back from something.
From the word’s history
The packet traces the word through Middle French repulsion to Latin repulsus, the same family as repel and repulsive; the shared picture is being pushed away.
資料來源把它追到中古法文 répulsion，再到拉丁文 repulsus，和 repel、repulsive 同一家，共同的畫面就是「被推開」。
Wiktionary etymology_text supplied in packet (kaikki:3f6f69a190036ae4:1167566724): Borrowed from Middle French repulsion, from Late Latin repulsio, repulsionem, from Latin repulsus.
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