corrugate
Concise Oxford English Dictionary © 2008 Oxford University Press:
corrugate /ˈkɒrʊgeɪt/
▶verb contract into wrinkles or folds.
– origin ME: from L. corrugat-, corrugare ‘to wrinkle’, from cor- (expressing intensive force) + rugare (from ruga ‘a wrinkle’).
'corrugate' also found in these Oxford entries:

