Sit Up (Verb)
Meaning 1
Not go to bed; "Don't stay up so late--you have to go to work tomorrow"; "We sat up all night to watch the election".
Classification
Verbs of grooming, dressing and bodily care.
Synonyms
Hypernyms
Meaning 2
Change to an upright sitting position; "He sat up in bed".
Classification
Verbs of walking, flying, swimming.