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.]