deraign
To prove or refute, especially through combat.
obsolete, transitive
To engage in battle or combat.
obsolete
Therewith they gan to hurtlen greedily, / Redoubted battaile ready to darrayne, / And clash their shields, and shake their swords on hy [...].
To determine or decide by combat; to fight out.
obsolete, transitive
Now everything I had or sought, I've lost; / Upon a glimpse, I am disparadised. / So: go defiant to the nether world, / And darreign^([sic]) Lucifer's dread minions to / Worse torment than thou wouldst do thyself.
To ready or prepare for combat.
obsolete, transitive
Where it comes from
Inherited from Middle English dereynen, from Old French deraisnier (“to explain, defend, to maintain in legal action by proof and reasonings”), from Late Latin derationare (“to discourse, contend in law”).
Adapted from the Wiktionary entry deraign (CC BY-SA 4.0).