Etymology
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crumple (v.)

early 14c.,  cromplen, crumplen, "press into irregular folds, rumple, wrinkle," also intransitive, "contract into wrinkles, shrink, shrivel," frequentative of crumpen "to curl up" (from Old English crump "bent, crooked"), from Proto-Germanic *krumbo- "to press, squeeze, compress" (source also of German krumm "crooked, warped"). Related: Crumpled; crumpling.

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Definitions of crumple

crumple (v.)
fall apart;
Synonyms: crumble / tumble / break down / collapse
crumple (v.)
fold or collapse;
Synonyms: buckle
crumple (v.)
to gather something into small wrinkles or folds;
Synonyms: pucker / rumple / cockle / knit
crumple (v.)
become wrinkled or crumpled or creased;
Synonyms: rumple / wrinkle / crease / crinkle
From wordnet.princeton.edu