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English definition of “sit up”

sit up

(NOTICE) informal phrasal verb with sit     /sɪt/ verb (present participle sitting, past tense and past participle sat)
to show interest or surprise: The news that he was getting married really made her sit up.Excited, interested and enthusiastic
(Definition of sit up (NOTICE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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