The Collaborative International Dictionary of English v.0.48:

Cob \Cob\, v. t. [imp. & p. p. Cobbed; p. pr. & vb. n.
   Cobbing.]
   1. To strike [Prov. Eng.] --Halliwell.
      [1913 Webster]

   2. (Mining) To break into small pieces, as ore, so as to sort
      out its better portions. --Raymond.
      [1913 Webster]

   3. (Naut.) To punish by striking on the buttocks with a
      strap, a flat piece of wood, or the like.
      [1913 Webster] Cobaea