crumple

Verb
  1. Fall apart (synset 202045722)
    "the building crumbled after the explosion"; "Negotiations broke down"
  2. Fold or collapse (synset 201281789)
    "His knees buckled"
  3. To gather something into small wrinkles or folds (synset 201281420)
    "She puckered her lips"
  4. Become wrinkled or crumpled or creased (synset 200565934)
    "This fabric won't wrinkle"

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