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]