Picture a square corner, the hard ninety-degree line where a tabletop meets its side. Now slice that corner away. What is left is a narrow slanted face running along the edge, and the two surfaces no longer collide — they open out into each other. That opening is the whole word. Everything else is a different grip on it: the slanted face itself, the act of cutting it, the tool that holds the angle while you copy it, and the plain describing word for anything set at that slant.
From the word’s history
The packet's Wiktionary entry takes bevel back through Anglo-Norman to Old French baïf, 'open-mouthed', from baer 'to gape'. The source marks this route as uncertain, but the picture matches what the word describes: two surfaces opening out instead of meeting square.
資料裡的 Wiktionary 說明把 bevel 經由盎格魯-諾曼語回溯到古法文 baïf（嘴巴張開的），再往前是 baer（張口）。這條線在來源上被標成「可能」，不是確定的。不過畫面確實對得起來：兩個面張開，而不是直角硬碰。
Wiktionary etymology supplied in this packet (kaikki:3f6f69a190036ae4:1239678576): Middle English *bevel < Anglo-Norman *baivel, diminutive of Old French baïf 'open-mouthed' < baer 'to gape' (marked 'perhaps' in the source)
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