ルビコン川がわを渡わたる

expression, godan verb (-ru)

cross the Rubicon; pass the point of no return

Idiomatic expression derived from Julius Caesar's historical crossing of the Rubicon River. Used when making an irreversible decision or committing to a risky course of action.

• 彼かれは会かい社しゃを辞やめて独どく立りつすることを決けつ意いし、まさにルビコン川がわを渡わたった。

  He decided to quit his job and start his own business, truly crossing the Rubicon.

• この法ほう案あんが可か決けつされれば、政せい府ふはルビコン川がわを渡わたることになるだろう。

  If this bill passes, the government will have crossed the Rubicon.