Meaning of “crumple” - Learner’s Dictionary

crumple

verb uk us /ˈkrʌmpl/
CRUSH [ I, T ]

If something such as paper or cloth crumples, it becomes crushed, and if you crumple it, you crush it until it is full of folds:

a crumpled shirt
LOOK SAD [ I ]

If someone's face crumples, they suddenly look very sad or disappointed.

(Definition of “crumple” from the Cambridge Learner’s Dictionary © Cambridge University Press)