The Collaborative International Dictionary of English v.0.48:

Rib \Rib\, v. t. [imp. & p. p. Ribbed; p. pr. & vb. n.
   Ribbing.]
   1. To furnish with ribs; to form with rising lines and
      channels; as, to rib cloth.
      [1913 Webster]

   2. To inclose, as with ribs, and protect; to shut in.
      [1913 Webster]
      [1913 Webster]

            It [lead] were too gross
            To rib her cerecloth in the obscure grave. --Shak.
      [1913 Webster]

   To rib land, to leave strips of undisturbed ground between
      the furrows in plowing.
      [1913 Webster]