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1. Of paper, fabric, or a similar material, to form into a ball. In this usage, a noun or pronoun can be used between "crumple" and "up." My first draft of the poem was so bad that I just crumpled it up and threw it in the trash can. You can't just keep crumpling up your shirts and throwing them back in the closet—use the hamper please!
2. To collapse. I hardly remember the end of the marathon because I crumpled up as soon as I crossed the finish line.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
crumple something up
to fold up or crush someone or something. Walter crumpled the paper up. He crumpled up the paper.
to fold up; to collapse. She was so frightened that she just crumpled up. Fran crumpled up in a dead faint.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.