up-and-down
adj.
1610s, from adverbial phrase up and down (c.1200); see up, adv. + down, adv..
| 词汇 | up-and-down |
| 词根词缀 | Online Etymology Dictionary up-and-down adj. 1610s, from adverbial phrase up and down (c.1200); see up, adv. + down, adv.. |
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