那條斜面本身
核心畫面直接落在東西上：削掉直角之後留下的那條斜面，以及形容「斜的」那個字。
noun · C1
A narrow flat edge cut at a slant, so that two surfaces meet at an open angle instead of a square corner. You see one along the edge of wood, glass, metal, or stone.
斜邊／斜面
核心畫面
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.
可以想成一個直角：桌面和側面硬碰硬撞在一起的那條九十度的線。現在把那個角削掉。留下來的是一條窄窄的斜面，兩個面不再是…更多收起
可以想成一個直角：桌面和側面硬碰硬撞在一起的那條九十度的線。現在把那個角削掉。留下來的是一條窄窄的斜面，兩個面不再是直接相撞，而是張開來接在一起。這個「張開」就是整個字。其他用法只是換一個角度抓住它：斜面本身、把斜面削出來的動作、幫你把角度夾住好複製的工具，以及單純形容「斜的」那個字。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)
Two branches
做出斜面、量出斜面
從那條斜面往外走一步：一個是把它削出來的動作，一個是幫你把角度夾住、搬到下一塊材料上的工具。兩個都以那條斜面命名。
noun · C1
A tool made of two flat arms joined at one end. You open the arms to whatever angle you need and use it to mark or check a slanting edge. Its full name is a bevel square.
斜角規