press or crush into folds or creases
become full of irregular folds by pressing, crushing, etc.
"the building crumbled after the explosion"
"Negotiations broke down"
"His knees buckled"
"She puckered her lips"
"This fabric won't wrinkle"
Don't crumple that scarf.
To crumple the page into a ball and throw it away.
出自： M. Shadbolt