wrinkle

v. crease; become creased

n. crease; fold; trick, maneuver (Slang)

A wrinkle is a ridge or crease of a surface. It usually refers to folds on fabric or clothes, or on the skin of an organism; the folds are generally random and do not exhibit any repeating pattern. In skin or other foldable material a wrinkle or fold may be permanent if the material is folded the same way each time.
See more at Wikipedia.org...

(v. t.)
To contract into furrows and prominences; to make a wrinkle or wrinkles in; to corrugate; as, wrinkle the skin or the brow.
  

(v. t.)
Hence, to make rough or uneven in any way.
  

(v. i.)
To shrink into furrows and ridges.
  

(n.)
hence, any roughness; unevenness.
  

(n.)
A winkle.
  

(n.)
A small ridge, prominence, or furrow formed by the shrinking or contraction of any smooth substance; a corrugation; a crease; a slight fold; as, wrinkle in the skin; a wrinkle in cloth.
  

(n.)
A notion or fancy; a whim; as, to have a new wrinkle.
  

A drawcard feature of a new product or security which entices a buyer.