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English definition of “sit up”

sit up

(STRAIGHT) phrasal verb with sit     /sɪt/ verb (present participle sitting, past tense and past participle sat)
to sit with a straight back: How many times do I have to tell you children to sit up straight ?Sitting and standing
(Definition of sit up (STRAIGHT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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