恋こい乱みだる

nidan verb (lower class) with 'ru' ending (archaic), intransitive verb

to be lovesick

Archaic intransitive verb describing a state of emotional turmoil from love. Not used in modern Japanese; encountered only in classical texts.

• 古こ典てんでは「恋こい乱みだる」と書かいて、恋こいに心こころが乱みだれるさまを表あらわした。

  In classical texts, 恋い乱る was written to express the state of one's heart being disturbed by love.