The Collaborative International Dictionary of English v.0.48:

Bash \Bash\, v. t. [imp. & p. p. Bashed; p. pr. & vb. n.
   Bashing.] [Perh. of imitative origin; or cf. Dan. baske to
   strike, bask a blow, Sw. basa to beat, bas a beating.]
   To strike heavily; to beat; to crush. [Prov. Eng. & Scot.]
   --Hall Caine.
   [1913 Webster]

         Bash her open with a rock.               --Kipling.
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Bash \Bash\, n.
   1. a forceful blow, especially one that does damage to its
      target.
      [PJC]

   2. a elaborate or lively social gathering or party.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Bash \Bash\, v. t. & i. [OE. baschen, baissen. See Abash.]
   To abash; to disconcert or be disconcerted or put out of
   countenance. [Obs.]
   [1913 Webster]

         His countenance was bold and bashed not. --Spenser.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bash
    n 1: a vigorous blow; "the sudden knock floored him"; "he took a
         bash right in his face"; "he got a bang on the head" [syn:
         knock, bash, bang, smash, belt]
    2: an uproarious party [syn: bash, do, brawl]
    v 1: hit hard [syn: sock, bop, whop, whap, bonk,
         bash]

Moby Thesaurus II by Grady Ward, 1.0:

77 Moby Thesaurus words for "bash":
   bang, bat, batter, beat, beating, belt, biff, blow, blowout, bonk,
   bruise, buffet, bung, bung up, chop, clap, clip, clobber, clout,
   clump, coldcock, contuse, crack, cut, dash, deal, deal a blow,
   deck, dig, dint, drub, drubbing, drumming, fetch, fetch a blow,
   fusillade, hit, hit a clip, jab, knock, knock cold, knock down,
   knock out, let have it, lick, maul, paste, pelt, plunk, poke,
   pound, punch, rap, shindy, slam, slog, slug, smack, smash, smite,
   snap, soak, sock, strike, strike at, stroke, swat, swing, swipe,
   tattoo, thump, thwack, wallop, whack, wham, whop, yerk



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

BASH
       Bourne-Again SHell (Unix, Shell)


The Free On-line Dictionary of Computing (30 December 2018):

bash

   Bourne Again SHell.  GNU's command interpreter for Unix.
   Bash is a Posix-compatible shell with full Bourne shell
   syntax, and some C shell commands built in.  The Bourne
   Again Shell supports Emacs-style command-line editing, job
   control, functions, and on-line help.  Written by Brian Fox of
   UCSB.

   The latest version is 1.14.1.  It includes a yacc parser,
   the interpreter and documentation.

   (ftp://ftp.gnu.org/bash-1.14.1.tar.gz) or from a
   GNU archive site.  E-mail: .
   Usenet newsgroup: news:gnu.bash.bug.

   (1994-07-15)