一いっ糸し乱みだれぬ

expression, noun-modifying (irregular)

perfectly ordered; perfectly coordinated

Describes a group or arrangement that is flawlessly synchronized or uniform, often used for military formations, dance, or precise teamwork. The negative form ぬ is classical but still common in this set phrase.

See also: 一糸乱れず (いっしみだれず)

• 選せん手しゅたちの一いっ糸し乱みだれぬ動うごきに観かん客きゃくは圧あっ倒とうされた。

  The audience was overwhelmed by the athletes' perfectly coordinated movements.

• 一いっ糸し乱みだれぬ隊たい列れつが行こう進しんしていく。

  A perfectly ordered formation marches on.