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sit up

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

Definition

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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