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to sit up
[phrase form: sit]
01
to change one's position from a lying position into an upright one
Examples
After a long nap on the couch, she suddenly sat up, realizing she had overslept.
02
to stay awake beyond the usual or expected time
Examples
I had to sit up late last night to finish my assignment for school.
03
to help a person to move from a reclined position to a seated one
Examples
The nurse gently sat up the patient in bed to administer the medication.
04
to pay attention or show interest, especially in a particular topic or conversation
Examples
The audience sat up as the guest speaker shared personal anecdotes that captivated everyone's attention.
