scrunch up

Verb

• make wrinkles or creases on a smooth surface; make a pressed, folded or wrinkled line in
  • The dress got wrinkled
    
  • crease the paper like this to make a crane
    

• sit on one's heels
  • In some cultures, the women give birth while squatting
    
  • The children hunkered down to protect themselves from the sandstorm
    

Related words

• Synonyms: 
  wrinkle , ruckle , crease , crinkle , scrunch , crisp , squat , crouch , hunker , hunker down