Source : Webster's Revised Unabridged Dictionary (1913)

Gib \Gib\, n. [Abbreviated fr. Gilbert, the name of the cat in
   the old story of ``Reynard the Fox''. in the ``Romaunt of the
   Rose'', etc.]
   A male cat; a tomcat. [Obs.]

Gib \Gib\, v. i.
   To act like a cat. [Obs.] --Beau. & Fl.

Gib \Gib\, n. [Etymol. uncertain.]
   A piece or slip of metal or wood, notched or otherwise, in a
   machine or structure, to hold other parts in place or bind
   them together, or to afford a bearing surface; -- usually
   held or adjusted by means of a wedge, key, or screw.

   {Gib and key}, or {Gib and cotter} (Steam Engine), the fixed
      wedge or gib, and the driving wedge,key, or cotter, used
      for tightening the strap which holds the brasses at the
      end of a connecting rod.

Gib \Gib\, v. t. [imp. & p. p. {Gibbed}; p. pr. & vb. n.
   {Gibbing}.]
   To secure or fasten with a gib, or gibs; to provide with a
   gib, or gibs.

   {Gibbed lathe}, an engine lathe in which the tool carriage is
      held down to the bed by a gib instead of by a weight.

Gib \Gib\, v. i.
   To balk. See {Jib}, v. i. --Youatt.

Source : WordNet®

gib
     n : a castrated tomcat
     [also: {gibbing}, {gibbed}]