The Collaborative International Dictionary of English v.0.48:

Dimple \Dim"ple\, v. i. [imp. & p. p. Dimpled; p. pr. & vb. n.
   Dimpling.]
   To form dimples; to sink into depressions or little
   inequalities.
   [1913 Webster]

         And smiling eddies dimpled on the main.  --Dryden.
   [1913 Webster]