起伏;上下波动;沿…来来回回
起伏;上下波动
moving upwards and downwards
The boat bobbed up and down on the water.小船在水面颠簸。
来回;往复
in one direction and then in the opposite direction
She was pacing up and down in front of her desk.她在办公桌前踱来踱去。
时好时坏
sometimes good and sometimes bad
My relationship with him was up and down.我跟他的关系忽冷忽热。
口语美式
绝对地;肯定地;完全地
if you swear up and down that sth is true, you say that it is definitely true
up and down sth
沿…来来回回
in one direction and then in the opposite direction along sth
I looked up and down the corridor.我来回扫视着走廊。
释义来自《牛津高阶英汉双解词典》第 9 版