The Collaborative International Dictionary of English v.0.48:

Gouge \Gouge\, n. [F. gouge. LL. gubia, guvia, gulbia, gulvia,
   gulvium; cf. Bisc. gubia bow, gubioa throat.]
   [1913 Webster]
   1. A chisel, with a hollow or semicylindrical blade, for
      scooping or cutting holes, channels, or grooves, in wood,
      stone, etc.; a similar instrument, with curved edge, for
      turning wood.
      [1913 Webster]

   2. A bookbinder's tool for blind tooling or gilding, having a
      face which forms a curve.
      [1913 Webster]

   3. An incising tool which cuts forms or blanks for gloves,
      envelopes, etc. from leather, paper, etc. --Knight.
      [1913 Webster]

   4. (Mining) Soft material lying between the wall of a vein
      and the solid vein. --Raymond.
      [1913 Webster]

   5. The act of scooping out with a gouge, or as with a gouge;
      a groove or cavity scooped out, as with a gouge.
      [1913 Webster]

   6. Imposition; cheat; fraud; also, an impostor; a cheat; a
      trickish person. [Slang, U. S.]
      [1913 Webster]

   Gouge bit, a boring bit, shaped like a gouge.
      [1913 Webster]

WordNet (r) 3.0 (2006):

gouge
    n 1: an impression in a surface (as made by a blow) [syn:
         dent, ding, gouge, nick]
    2: and edge tool with a blade like a trough for cutting channels
       or grooves
    3: the act of gouging
    v 1: force with the thumb; "gouge out his eyes" [syn: gouge,
         force out]
    2: obtain by coercion or intimidation; "They extorted money from
       the executive by threatening to reveal his past to the
       company boss"; "They squeezed money from the owner of the
       business by threatening him" [syn: extort, squeeze,
       rack, gouge, wring]
    3: make a groove in [syn: rout, gouge]