The Collaborative International Dictionary of English v.0.48:

Lash \Lash\, v. i.
   To ply the whip; to strike; to utter censure or sarcastic
   language.
   [1913 Webster]

         To laugh at follies, or to lash at vice. --Dryden.
   [1913 Webster]

   To lash out, to strike out wildly or furiously; also used
      figuratively.
      [1913 Webster]