理りに落おちる

expression, ichidan verb

become overly logical; split hairs

Used when someone gets stuck in excessive logic, losing sight of practicality or common sense. Often carries a negative nuance of being pedantic or hairsplitting.

• 彼かれは議ぎ論ろんになるとすぐ理りに落おちてしまう。

  He quickly becomes overly logical when it comes to arguments.

• 理りに落おちすぎて、かえって話はなしが通つうじなくなった。

  He got so caught up in splitting hairs that we couldn't communicate anymore.