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English definition of “stand up”

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stand up

verb uk phrasal verb with stand   /stænd/ (stood, stood) us  
A2 to be in an upright position on your feet; to get yourself into an upright position on your feet: I've been standing up all day and I'm really tired. It was customary then for children to stand up when the teacher came into the classroom.
If an idea or some information stands up, it is proved to be true or correct: Their evidence will never stand up in court. Their argument won't stand up to detailed criticism (= when it is studied critically).
(Definition of stand up phrasal verb, verb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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