Source : Webster's Revised Unabridged Dictionary (1913)

Bilge \Bilge\ (b[i^]lj), v. i. [imp. & p. p. {Bilged}
   (b[i^]ljd); p. pr. & vb. n. {Bilging}.]
   1. (Naut.) To suffer a fracture in the bilge; to spring a
      leak by a fracture in the bilge.

   2. To bulge.

Bilge \Bilge\, v. t.
   1. (Naut.) To fracture the bilge of, or stave in the bottom
      of (a ship or other vessel).

   2. To cause to bulge.

Bilge \Bilge\, n. [A different orthography of bulge, of same
   origin as belly. Cf. {Belly}, {Bulge}.]
   1. The protuberant part of a cask, which is usually in the
      middle.

   2. (Naut.) That part of a ship's hull or bottom which is
      broadest and most nearly flat, and on which she would rest
      if aground.

   3. Bilge water.

   {Bilge free} (Naut.), stowed in such a way that the bilge is
      clear of everything; -- said of a cask.

   {Bilge pump}, a pump to draw the bilge water from the gold of
      a ship.

   {Bilge water} (Naut.), water which collects in the bilge or
      bottom of a ship or other vessel. It is often allowed to
      remain till it becomes very offensive.

   {Bilge ways}, the timbers which support the cradle of a ship
      upon the ways, and which slide upon the launching ways in
      launching the vessel.

Source : WordNet®

bilge
     n 1: water accumulated in the bilge of a ship [syn: {bilge water}]
     2: where the sides of the vessel curve in to form the bottom

bilge
     v 1: cause to leak; "the collision bilged the vessel"
     2: take in water at the bilge; "the tanker bilged" [syn: {take
        in water}]