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English definition of “sit up”

sit up

(STAY AWAKE) phrasal verb with sit     /sɪt/ verb (present participle sitting, past tense and past participle sat)
to stay awake and not go to bed although it is late: [+ -ing verb] The book was so interesting that I sat up all night read ing it. I'll be late tonight , so don't sit up for (= wait for) me.Not sleeping and not unconscious
(Definition of sit up (STAY AWAKE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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