Princeton's WordNet

1. squat, crouch, scrunch, scrunch up, hunker, hunker down(verb)

   sit on one's heels

   "In some cultures, the women give birth while squatting"; "The children hunkered down to protect themselves from the sandstorm"

2. wrinkle, ruckle, crease, crinkle, scrunch, scrunch up, crisp(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"