Sit on one's heels. Synonyms:crouch, hunker, hunker down, scrunch, squat."The children hunkered down to protect themselves from the sandstorm"
2.
Make wrinkles or creases on a smooth surface; make a pressed, folded or wrinkled line in. Synonyms:crease, crinkle, crisp, ruckle, scrunch, wrinkle."Crease the paper like this to make a crane"