One way to hold spanner: a piece of shaped metal in your hand that takes hold of a nut and turns it. It has to grip before it can turn, and it is the grip that does the work.
spanner 可以想成一塊被削出形狀的金屬，握在手裡，咬住螺帽再轉。它一定要先「咬住」才轉得動，這個「咬住」的動作就是它的全部價值。想像手掌轉一圈，看不見的螺帽就跟著轉緊一分。後面幾個意思，都是從這支會咬住東西、也會把東西卡住的金屬工具長出來的。
From the word’s history
The supplied Wiktionary entry gives spanner as span + -er, that is, the thing that spans. That fits a tool that reaches across a nut and takes hold of both sides of it.
封包裡的 Wiktionary 說 spanner 來自 span 加上 -er，字面是「做跨越動作的那個東西」。這條線索對得上工具的樣子：它跨過螺帽，從兩邊把它扣住。所以先想「跨過去、扣住」，再想「轉」，這支工具的畫面就完整了。
Wiktionary, "spanner"
登入就可以看每一支怎麼連回核心畫面。