The Collaborative International Dictionary
Darrain
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.]
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To make ready to fight; to array. [Obs.]
Darrain your battle, for they are at hand.
--Shak. To fight out; to contest; to decide by combat. [Obs.] ``To darrain the battle.''
--Chaucer .
Wiktionary
darrain
alt. (fi-form of case=genitive pl=plural darra) n. (fi-form of case=genitive pl=plural darra) vb. 1 (context obsolete transitive English) To make ready to fight; to arm oneself for combat. 2 (context obsolete transitive English) To fight out; to contest; to decide by combat.