The Collaborative International Dictionary of English v.0.48:

Bulge \Bulge\ (b[u^]lj), n. [OE. bulge a swelling; cf. AS.
   belgan to swell, OSw. bulgja, Icel. b[=o]lginn swollen, OHG.
   belgan to swell, G. bulge leathern sack, Skr. b[.r]h to be
   large, strong; the root meaning to swell. Cf. Bilge,
   Belly, Billow, Bouge, n.]
   1. The bilge or protuberant part of a cask.
      [1913 Webster]

   2. A swelling, protuberant part; a bending outward, esp. when
      caused by pressure; as, a bulge in a wall.
      [1913 Webster]

   3. (Naut.) The bilge of a vessel. See Bilge, 2.
      [1913 Webster]

   Bulge ways. (Naut.) See Bilge ways.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Bulge \Bulge\, v. i. [imp. & p. p. Bulged; p. pr. & vb. n.
   Bulging.]
   1. To swell or jut out; to bend outward, as a wall when it
      yields to pressure; to be protuberant; as, the wall
      bulges.
      [1913 Webster]

   2. To bilge, as a ship; to founder.
      [1913 Webster]

            And scattered navies bulge on distant shores.
                                                  --Broome.
      [1913 Webster]

WordNet (r) 3.0 (2006):

bulge
    n 1: something that bulges out or is protuberant or projects
         from its surroundings; "the gun in his pocket made an
         obvious bulge"; "the hump of a camel"; "he stood on the
         rocky prominence"; "the occipital protuberance was well
         developed"; "the bony excrescence between its horns" [syn:
         bulge, bump, hump, swelling, gibbosity,
         gibbousness, jut, prominence, protuberance,
         protrusion, extrusion, excrescence]
    v 1: swell or protrude outwards; "His stomach bulged after the
         huge meal" [syn: bulge, pouch, protrude]
    2: bulge out; form a bulge outward, or be so full as to appear
       to bulge [syn: bulge, bag]
    3: bulge outward; "His eyes popped" [syn: start, protrude,
       pop, pop out, bulge, bulge out, bug out, come
       out]
    4: cause to bulge or swell outwards [syn: bulge, bulk]

Moby Thesaurus II by Grady Ward, 1.0:

114 Moby Thesaurus words for "bulge":
   advantage, allowance, bag, balloon, beetle, belly, belly out,
   bilge, billow, blain, bleb, blister, blob, boss, bouge, bow,
   bubble, bug, bulb, bulla, bump, bunch, burl, button, cahot, chine,
   clump, coign of vantage, condyle, convex, deadwood, dilate,
   distend, dowel, drop, ear, edge, expand, flange, flap,
   flying start, gall, gnarl, goggle, handicap, handle, head start,
   hill, hump, hunch, inside track, jog, joggle, jump, jut, knob,
   knot, knur, knurl, lip, loop, lump, mole, mountain, nevus, nub,
   nubbin, nubble, odds, overhand, overhang, papilloma, peg, poke,
   pooch, pop, pouch, pout, project, projection, protrude, protrusion,
   protuberance, protuberate, rib, ridge, ring, round out,
   running start, shoulder, something extra, something in reserve,
   spine, stand out, start, stick out, stud, style, swell, swell out,
   swelling, tab, tubercle, tubercule, upper hand, vantage,
   vantage ground, vantage point, verruca, vesicle, wale, wart, welt,
   whip hand