corrugate
verb
[ ˈkɒrʊɡeɪt ]
• contract or cause to contract into wrinkles or folds.
• "Micky's brow corrugated in a simian frown"
Origin:
late Middle English: from Latin corrugat- ‘wrinkled’, from the verb corrugare, from cor- (expressing intensive force) + rugare (from ruga ‘a wrinkle’).
