一いち大だい事じ

noun

important matter; serious affair; emergency

Refers to a matter of great importance, often with a sense of urgency or gravity. Used in both formal and everyday contexts.

• これは一いち大だい事じだ。すぐに対たい策さくを考かんがえなければ。

  This is a serious matter. We must think of countermeasures immediately.

• 首