noun.
A slight ridge in or raised line on a surface caused by contraction, folding, puckering, or rumpling; a line of corrugation, generally one of a series, either regularly or irregularly disposed; a crease: as, wrinkles in a garment, or in an old man's face; wrinkles (small corrugations) in a rock.
To form wrinkles in: contract, fold, or pucker into small ridges and furrows or creases; corrugate; crease.
To become contracted into wrinkles; shrink into furrows and ridges; be marked with wrinkles.
noun.
A short pithy piece of information or advice; a valuable hint; a bit of useful knowledge or instruction; a good idea; a trick; a point; a notion; a device.