The Collaborative International Dictionary of English v.0.48:

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.
      [1913 Webster]

   2. To bulge.
      [1913 Webster]