verb / noun
crumple
KRUM-pul/ˈkrʌmpl/
To collapse into a crushed or folded shape.
The paper crumples as the man squeezes it between both hands.

Etymology
“Curl up” combines with an ending suggesting repeated action: crumpling produces many irregular folds or wrinkles rather than a single bend.
In context
… a rifle drop and 6 ft of khaki crumple up.
More examples
- The car's hood crumpled when it struck the pole.
- His knees give way, and he crumples to the floor.
- She smooths out a crumple in the wrapping paper.
Forms
crumple · crumples · crumpled · crumpling