1HBH [intransitive and transitive] also wrinkle up if you wrinkle a part of your face, or if it wrinkles, small lines appear on it :
2 [intransitive] if a piece of clothing wrinkles, it gets small untidy folds in it [= crease]:
The trouble with linen is that it wrinkles so easily.
The trouble with linen is that it wrinkles so easily.
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