crumple up

English

Verb

crumple up (third-person singular simple present crumples up, present participle crumpling up, simple past and past participle crumpled up)

1. (intransitive) To become crumpled or messily folded up.
2. (transitive) To crumple or messily fold (something).
3. (intransitive, figurative, by extension) To collapse; to give up and fold in a stressful situation.