WordWeb Online

1. Sit on one's heels
   "In some cultures, the women give birth while scrunching up";
   - squat, crouch, scrunch, hunker, hunker down
    
2. Make wrinkles or creases on a smooth surface; make a pressed, folded or wrinkled line in
   "The dress got scrunched up";
   - wrinkle, ruckle, crease, crinkle, scrunch, crisp

Derived forms: scrunches up, scrunched up, scrunching up

Type of: fold, fold up, sit, sit down, turn up