verb (v)

• fall apart(verb.motion)

  Synonym:
  break down, collapse, crumble, tumble
  

  source: wordnet30
• fold or collapse(verb.contact)

  Synonym:
  buckle
  

  source: wordnet30
• to gather something into small wrinkles or folds(verb.contact)

  Synonym:
  cockle, knit, pucker, rumple
  

  source: wordnet30
• become wrinkled or crumpled or creased(verb.change)

  Synonym:
  crease, crinkle, rumple, wrinkle
  

  source: wordnet30
• To draw or press into wrinkles or folds; to crush together; to rumple; as, to crumple paper.(verb)

  source: webster1913
• To contract irregularly; to show wrinkles after being crushed together; as, leaves crumple.(verb)

  source: webster1913