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English definition of “crumple sth up”

crumple sth up

phrasal verb with crumple     /ˈkrʌm.pl̩/ verb
to crush a piece of paper until all of it is folded: Sylvie crumpled up the letter and threw it in the bin.Making things more or less smooth or straight
(Definition of crumple sth up from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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