to go from a lying position to a sitting position, or to help someone to do this
to go to bed later than usual
to sit straight and not bend or lean
"That's cool," Alex said, exhaling loudly with each sit-up.
A stab of panic gripped him, that he might not be able to sit up again, except with assistance.
As he tried to sit up, a sharp pain speared through his head.
But the thought of her mum actually going made Ann sit up with shock.
He brought her a cup of coffee from an automatic pot, helped her sit up enough to drink the bitter liquid.
She would not give up her enormous roll top bath for some old-lady shower thing with a sit-up bath.
We sat her up in a chair.
We sat up very late talking last night.
Would you like to sit up and read for a while?
You’ve got to stop slouching and sit up straight.
sits up
sitting up
sat up
There is no origin for this phrasal verb
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