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;
"The dress got wrinkled"
"crease the paper like this to make a crane"
- The bedclothes are all crumpled up.
- Denim has been bleached and printed and scrunched up to achieve marbleized printing effects.