You can think of gasket as the soft thing that closes a gap so nothing gets out. Two hard parts bolted together never touch perfectly; a thin line of space is always left. Put a layer of rubber or cork in that line, tighten the bolts, and the layer squashes flat until there is no way through. Everything the word does grows out of that one picture: the part itself, what happens when it gives way under pressure, and — on a boat — a band tied round a sail to keep it shut.
From the word’s history
The source says gasket is perhaps from Middle French garcette. It marks the origin as uncertain, so it is offered here as a possibility rather than a fact.
來源說 gasket 可能來自中古法文 garcette，並且明白標了「可能」。所以這只能當一條參考線索，不能當定論。
Wiktionary (kaikki snapshot 3f6f69a190036ae4), gasket noun/verb entries, etymology_text: "Perhaps from Middle French garcette (gasket), from Old French garce, feminization of garçon." — marked as uncertain by the source.
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