crumple

(verb) fall apart. Synonyms: crumble, tumble, break down, collapse. Examples: "The building crumbled after the explosion." "Negotiations broke down."

(verb) fold or collapse. Synonyms: buckle. Example: "His knees buckled."

(verb) to gather something into small wrinkles or folds. Synonyms: pucker, rumple, cockle, knit. Example: "She puckered her lips."

(verb) become wrinkled or crumpled or creased. Synonyms: rumple, wrinkle, crease, crinkle. Example: "This fabric won't wrinkle."