crumple /ˈkɹʌmpəl/verb 4noun 1forms 3phrases 1 verb4 •To rumple; to press into wrinkles by crushing together.He crumpled the note and threw it away. •To become wrinkled.The car's body panels crumpled when they hit the post. •To cause to collapse.He crumpled the car's body panels when he backed into a post. •(figurative) To collapse; to surrender.The team's defensive strategy crumpled.The defenders crumpled owing to exhaustion and dehydration. noun1 •A crease, wrinkle, or irregular fold. formscrumpled · crumpling · crumples Phrases with crumple crumple upTo become crumpled or messily folded up.