up-and-downadj.

英 'ʌpən'daun | 美

中文adj. 上下起伏的；来来往往的；变动的；垂直的

词根词源

up-and-down (adj.)1610s, from adverbial phrase up and down (c. 1200); see up (adv.) + down (adv.).

关键词

up-and-down