#1 crumple v. [crumble, tumble, break down, collapse] fall apart; "the building crumbled after the explosion"; "Negotiations broke down". wn
#2 crumple v. [buckle] fold or collapse; "His knees buckled". wn
#3 crumple v. [pucker, rumple, cockle, knit] to gather something into small wrinkles or folds; "She puckered her lips". wn
#4 crumple v. [rumple, wrinkle, crease, crinkle] become wrinkled or crumpled or creased; "This fabric won't wrinkle". wn
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