One way to hold it: a gate standing across a water channel. While the gate is down, the water piles up behind it and goes nowhere. Lift the gate and a whole mass of water is released at once — fast, heavy, and going exactly where the channel points it. The noun names the channel and its gate; the verb names what the released water does, whether a person aims it at a dirty floor or a storm sends it down a window.
From the word’s history
The packet traces sluice through Middle English sluse and Anglo-Norman escluse back to Latin excludere, to shut out, the same root as exclude. Shutting water out is precisely what the gate does, so the oldest idea and the modern picture line up.
資料把 sluice 追到中古英文 sluse、古諾曼法文 escluse，再到拉丁文 exclūdere（把…關在外面），跟英文 exclude 同源。閘門的工作正是「把水擋在外面」，所以最早的想法和今天的畫面剛好對得上：先擋住，才有後來放開時的那股力量。
Wiktionary (kaikki extract) 'sluice' etymology_text: From Middle English sluse, alteration of scluse, from Anglo-Norman escluse, from Late Latin exclusa, from Latin exclūsus, form of exclūdō (to shut out).
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