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.
彼は会社を辞めて独立することを決意し、まさにルビコン川を渡った。
He decided to quit his job and start his own business, truly crossing the Rubicon.
If this bill passes, the government will have crossed the Rubicon.