Definition of sit up phrasal verb from the Oxford Advanced Learner's Dictionary

 

sit up

 phrasal verb
phrasal verb
 
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Phrasal Verbs
  1. 1to be or move yourself into a sitting position, rather than lying down or leaning back Do you feel well enough to sit up yet? Sit up straight—don't slouch.
  2. 2to not go to bed until later than usual We sat up half the night, talking.

sit up (and do something)

 
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(informal) to start to pay careful attention to what is happening, being said, etc. The proposal had made his clients sit up and take notice.
to move somebody into a sitting position after they have been lying down
See the Oxford Advanced American Dictionary entry: sit up

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