"Don't stay up so late--you have to go to work tomorrow"
"We sat up all night to watch the election"
"He sat up in bed"
1.坐起来;坐直
If yousit up, you move into a sitting position when you have been leaning back or lying down.
sit up在线翻译
e.g. Her head spins dizzily as soon as she sitsup.
她一坐起身来就感到天旋地转。
2.使…坐起身来;让…直起身子
If yousit someoneup, you move them into a sitting position when they have been leaning back or lying down.
e.g. She sat himup and made him comfortable.
她帮他坐起身来，好让他舒服一点。
3.深夜未睡;熬夜
If yousit up, you do not go to bed although it is very late.
e.g. We satup drinking and talking...
我们饮酒谈天，直至深夜。
e.g. I didn't feel like sittingup all night.
我不想熬通宵。
4.突然关注;警觉
If something makes yousit up, it makes you suddenly pay attention to what is happening.
e.g. A defeat like that makes yousitup and think.
那样的一次失败会令你警觉起来，开始思考。
5. see also: sit-up
