mainspring
n.
1590s, of watches, clocks, etc., from main, adj. + spring, n.3. Figurative use from 1690s.
| 词汇 | mainspring |
| 词根词缀 | Online Etymology Dictionary mainspring n. 1590s, of watches, clocks, etc., from main, adj. + spring, n.3. Figurative use from 1690s. |
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