crush (something, typically paper or cloth) so that it becomes creased and wrinkled:he crumpled up the paper bag (as adjective crumpled)a crumpled sheet
[no object] become creased, bent, or crooked:the bumper crumpled as it glanced off the wall
[no object] (of a person) suddenly flop down to the ground:she crumpled to the floor in a dead faint figurativeher composure crumpled
[no object] (of a person’s face) suddenly sag and show an expression of desolation:the child’s face crumpled and he began to howl
