What is the meaning of crumple?

verb

• Fall apart.
  • usage: "the building crumbled after the explosion"; "Negotiations broke down"
  • synonyms: crumble, tumble, break down, collapse
• Fold or collapse.
  • usage: "His knees buckled"
  • synonyms: buckle
• To gather something into small wrinkles or folds.
  • usage: "She puckered her lips"
  • synonyms: pucker, rumple, cockle, knit
• Become wrinkled or crumpled or creased.
  • usage: "This fabric won't wrinkle"
  • synonyms: rumple, wrinkle, crease, crinkle