The Collaborative International Dictionary of English v.0.48:

Gash \Gash\ (g[a^]sh), v. t. [imp. & p. p. Gashed (g[a^]sht);
   p. pr. & vb. n. Gashing.] [For older garth or garse, OF.
   garser to scarify, F. gercer to chap, perh. from an assumed
   LL. carptiare, fr. L. carpere, carptum, to pluck, separate
   into parts; cf. LL. carptare to wound. Cf. Carpet.]
   To make a gash, or long, deep incision in; -- applied chiefly
   to incisions in flesh.
   [1913 Webster]

         Grievously gashed or gored to death.     --Hayward.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Gash \Gash\, n.
   A deep and long cut; an incision of considerable length and
   depth, particularly in flesh.
   [1913 Webster]

WordNet (r) 3.0 (2006):

gash
    n 1: a wound made by cutting; "he put a bandage over the cut"
         [syn: cut, gash, slash, slice]
    2: a trench resembling a furrow that was made by erosion or
       excavation [syn: cut, gash]
    3: a strong sweeping cut made with a sharp instrument [syn:
       slash, gash]
    v 1: cut open; "she slashed her wrists" [syn: slash, gash]

Moby Thesaurus II by Grady Ward, 1.0:

331 Moby Thesaurus words for "gash":
   Vandyke, abrade, abrasion, abysm, abyss, amputate, arroyo, ax,
   bark, bezel, birthmark, bisect, blaze, blaze a trail, blemish,
   bloody, blotch, bones, box canyon, brand, breach, break, burn,
   butcher, canal, canalize, canyon, carve, caste mark, cavity, chafe,
   chaff, chalk, chalk up, chamfer, channel, chap, chase, chasm,
   check, check off, checkmark, chimney, chink, chip, chisel, chop,
   cicatrix, cicatrize, claw, cleave, cleft, cleuch, clough, col,
   concussion, corrugate, corrugation, coulee, couloir, crack,
   crackle, cranny, craze, crena, crenellate, crenulate, crevasse,
   crevice, crimp, culm, cut, cut apart, cut away, cut in two,
   cut off, cwm, dado, dapple, dash, deadwood, defile, define,
   delimit, dell, demarcate, depression, dichotomize, dike, discolor,
   discoloration, dishwater, dissever, ditch, donga, dot, draff, draw,
   dregs, dust, earmark, engrave, engraving, excavation, excise,
   fault, filings, fissure, flash burn, flaw, fleck, flick, flume,
   flute, fluting, fracture, fray, frazzle, freckle, fret, furrow,
   gall, gap, gape, garbage, goffer, gorge, gouge, graving, groove,
   gulch, gulf, gully, hack, halve, hatch, hew, hogwash, hole, hurt,
   husks, impress, imprint, incise, incision, indent, indentation,
   injure, injury, jag, jigsaw, jog, joggle, joint, jot, kerf, kloof,
   knurl, lacerate, laceration, lance, leak, leavings, lees, lentigo,
   lesion, line, machicolate, macula, maim, make a mark,
   make mincemeat of, mark, mark off, mark out, marking, maul,
   microgroove, mill, moat, mole, mortal wound, mottle, mutilate,
   mutilation, nevus, nick, nip, nock, notch, nullah, offal,
   offscourings, open, opening, orts, pare, parings, pass, passage,
   patch, pencil, pepper, picot, pierce, pink, pleat, plow, point,
   polka dot, potsherds, prick, print, prune, punch, punctuate,
   puncture, rabbet, rags, raspings, ravine, refuse, rend, rent,
   riddle, rifle, rifling, rift, rime, rip, rive, ruck, run, rupture,
   rut, savage, saw, scald, scallop, scar, scarification, scarify,
   scissor, scissure, scorch, score, scotch, scourings, scrap iron,
   scrape, scraps, scratch, scratching, scuff, scum, seal, seam,
   second-degree burn, serrate, sever, shards, shavings, skin, slack,
   slag, slash, slice, slit, slop, slops, slot, snip, sore, speck,
   speckle, splash, split, splotch, spot, sprain, stab, stab wound,
   stain, stamp, stick, stigma, stigmatize, strain, strawberry mark,
   streak, stria, striate, striation, stripe, stubble, sulcation,
   sulcus, sunder, sweepings, swill, tares, tattoo, tattoo mark, tear,
   third-degree burn, tick, tick off, tittle, tooth, trace, trauma,
   traumatize, trench, trough, underline, underscore, valley, void,
   wadi, wastage, waste, waste matter, wastepaper, watermark, weeds,
   well-worn groove, whittle, wound, wounds immedicable, wrench,
   wrinkle



V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

GASH
       Group Admin SHell (Unix, Shell)