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sit up

(NOTICE) informal phrasal verb with sit
 
 
/sɪt/ verb (present tense sitting, past tense and past participle sat)

Definition

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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