a slight ridge in the smoothness of a surface, such as a crease in the skin as a result of age
—vb
2.
to make or become wrinkled, as by crumpling, creasing, or puckering
[C15: back formation from wrinkled, from Old English gewrinclod, past participle of wrinclian to wind around; related to Swedish vrinka to sprain, Lithuanian reñgti to twist. See wrench]