scrunch up in WordNet English dictionary

1. 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"
   wrinkle  ruckle  crease  crinkle  scrunch  scrunch up  crisp 
   
2. sit on one's heels
   "In some cultures, the women give birth while squatting"; "The children hunkered down to protect themselves from the sandstorm"
   squat  crouch  scrunch  scrunch up  hunker  hunker down