definition of
scrunch up

[1] #1 scrunch up v. sit on one's heels; "In some cultures, the women give birth while squatting"; "The children hunkered down to protect themselves from the sandstorm". wn

[2] #2 scrunch up v. 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". wn