WordWeb Online

1. Of metal e.g.
   "a car with a crumpled front end"
   - bent, dented

1. Fall apart
   "the building crumpled after the explosion"
   - crumble, tumble, break down, collapse
    
2. Fold or collapse
   "His knees crumpled"
   - buckle
    
3. To gather something into small wrinkles or folds
   "She crumpled her lips"
   - pucker, rumple, cockle, knit
    
4. Become wrinkled or crumpled or creased
   "This fabric won't crumple"
   - rumple, wrinkle, crease, crinkle

See also: damaged

Type of: break, cave in, change integrity, collapse, crease, crinkle, crisp, fall in, fold, fold up, founder, give, give way, ruckle, scrunch, scrunch up, wrinkle