scrunch up

verbs

sit on one's heels
"In some cultures, the women give birth while squatting"; "The children hunkered down to protect themselves from the sandstorm"
crouch, hunker, hunker down, scrunch, scrunch up, squat
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"
crease, crinkle, crisp, ruckle, scrunch, scrunch up, wrinkle