—v.t. 1. to press or crush into irregular folds or into a compact mass; bend out of shape; rumple; wrinkle.
2. to cause to collapse or give way suddenly: That right hook to the midsection crumpled him.
—v.i. 1. to contract into wrinkles; shrink; shrivel.
2. to give way suddenly; collapse: The bridge crumpled under the weight of the heavy trucks.
—n. an irregular fold or wrinkle produced by crumpling.