Bedeutung von “sit up” — Learner’s Dictionary

sit up

phrasal verb with sit us uk /sɪt/ verb present participle sitting, past tense and past participle sat
MOVEMENT

to move your body to a sitting position after you have been lying down:

I sat up and opened my eyes.
STAY AWAKE

to stay awake and not go to bed although it is late:

(Definition von “sit up” aus dem Cambridge Learner's Dictionary © Cambridge University Press)