These are word's definitions related to sit-up. Click on any word to go to its word's detail page. Or, go to the definition of sit-up.
1 to stay awake and not go to bed although it is late:
[ + -ing verb ] The book was so interesting that I sat up all night reading it.
3 a type of exercise in which someone sits up from a lying position, designed to make the abdominal muscles stronger
4 to straighten your body or move into a sitting position:
5 to stay awake late, esp. past the time that you usually go to bed:
We sat up talking until 2 a.m.
6 an exercise that strengthens your stomach muscles, in which you lie down and lift yourself into a sitting position without using your arms