n. & v.
--n.
1. a slight crease or depression in the skin such as is produced by age.
2 a similar mark in another flexible surface.
3 colloq. a useful tip or clever expedient.
--v.
1. tr. make wrinkles in.
2 intr. form wrinkles; become marked with wrinkles.
Etymology: orig. repr. OE gewrinclod sinuous