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English definition of “sit (sb) up”

sit (sb) up

phrasal verb with sit     /sɪt/ verb (present participle sitting, past tense and past participle sat)
to move into a sitting position after you have been lying down, or to help someone else to do this: Let me sit you up in the bed so you'll be more comfortable.Sitting and standing
(Definition of sit (sb) up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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