Meaning of scrunch up

(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"

make wrinkles or creases on a smooth surface; make a pressed, folded or wrinkled line in; `crisp' is archaic; "The dress got wrinkled"; "crease the paper like this to make a crane"