Source : Webster's Revised Unabridged Dictionary (1913)

Cave \Cave\, n. (Eng. Politics)
   A coalition or group of seceders from a political party, as
   from the Liberal party in England in 1866. See {Adullam},
   {Cave of}, in the Dictionary of Noted Names in Fiction.

Cave \Cave\, v. t. [imp. & p. p. {Caved}; p. pr. & vb. n.
   {Caving}.] [Cf. F. caver. See {Cave}, n.]
   To make hollow; to scoop out. [Obs.]

         The mouldred earth cav'd the banke.      --Spenser.

Cave \Cave\, v. i.
   1. To dwell in a cave. [Obs.] --Shak.

   2. [See To cave in, below.] To fall in or down; as, the sand
      bank caved. Hence (Slang), to retreat from a position; to
      give way; to yield in a disputed matter.

   {To cave in}. [Flem. inkalven.]
      (a) To fall in and leave a hollow, as earth on the side of
          a well or pit.
      (b) To submit; to yield. [Slang] --H. Kingsley.

Cave \Cave\ (k[=a]v), n. [F. cave, L. cavus hollow, whence cavea
   cavity. Cf. {Cage}.]
   1. A hollow place in the earth, either natural or artificial;
      a subterraneous cavity; a cavern; a den.

   2. Any hollow place, or part; a cavity. [Obs.] ``The cave of
      the ear.'' --Bacon.

   {Cave bear} (Zo["o]l.), a very large fossil bear ({Ursus
      spel[ae]us}) similar to the grizzly bear, but large;
      common in European caves.

   {Cave dweller}, a savage of prehistoric times whose dwelling
      place was a cave. --Tylor.

   {Cave hyena} (Zo["o]l.), a fossil hyena found abundanty in
      British caves, now usually regarded as a large variety of
      the living African spotted hyena.

   {Cave lion} (Zo["o]l.), a fossil lion found in the caves of
      Europe, believed to be a large variety of the African
      lion.

   {Bone cave}. See under {Bone}.

Source : WordNet®

cave
     v 1: hollow out as if making a cave or opening; "The river was
          caving the banks" [syn: {undermine}]
     2: explore natural caves [syn: {spelunk}]

cave
     n : an underground enclosure with access from the surface of the
         ground or from the sea