wrinkle

Concise Oxford English Dictionary © 2008 Oxford University Press:
wrinkle/ˈrɪŋkl/

▶noun

• 1 a slight line or fold, especially in fabric or the skin of the face.

• 2 informal a clever innovation, or useful piece of information or advice.

▶verb (often as adj. wrinkled) make or become wrinkled.

– origin ME: origin obscure, possibly a back-form. from the OE past part. gewrinclod ‘sinuous’.