sit(sb)up
—phrasal verbwithsitverbuk/sɪt/us/sɪt/present participlesitting|past tense and past participlesat
tomoveinto asittingpositionafter you have beenlyingdown, or tohelpsomeoneelseto do this
（使）坐起来；（帮某人）坐起来
Let mesityou up in thebedso you'll be morecomfortable.我帮你从床上坐起来吧，这样你会更舒服些。