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crumple sth up

phrasal verb with crumple
 
 
/ˈkrʌm.pl̩/ verb

Definition

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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