Synonyms : crump, thud

Example : In some cultures, the women give birth while squatting.
The children hunkered down to protect themselves from the sandstorm.

Synonyms : crouch, hunker, hunker down, scrunch up, squat

Example : The dress got wrinkled.
Crease the paper like this to make a crane.

Synonyms : crease, crinkle, crisp, ruckle, scrunch up, wrinkle