Source : Webster's Revised Unabridged Dictionary (1913)

Darraign \Dar"raign\, Darrain \Dar"rain\,, v. t. [OF. deraisnier
   to explain, defend, to maintain in legal action by proof and
   reasonings, LL. derationare; de- + rationare to discourse,
   contend in law, fr. L. ratio reason, in LL., legal cause. Cf.
   {Arraign}, and see {Reason}.]
   1. To make ready to fight; to array. [Obs.]

            Darrain your battle, for they are at hand. --Shak.

   2. To fight out; to contest; to decide by combat. [Obs.] ``To
      darrain the battle.'' --Chaucer .