crumple

Verb

• become wrinkled or crumpled or creased
  • This fabric won't wrinkle
    

• to gather something into small wrinkles or folds
  • She puckered her lips
    

• fold or collapse
  • His knees buckled
    

• fall apart
  • the building crumbled after the explosion
    
  • Negotiations broke down
    

Related words

• Synonyms: 
  rumple , wrinkle , crease , crinkle , pucker , cockle , knit , buckle , crumble , tumble , break down , collapse