日本語WordNet
the boundary in ancient times between Italy and Gaul; Caesar's crossing it with his army in 49 BC was an act of war
a line that when crossed permits of no return and typically results in irrevocable commitment
AIによる解説
A point of no return; a decisive, irreversible action. From Caesar crossing the Rubicon River to start a civil war. 'Crossing the Rubicon' means making a commitment that cannot be undone.
ライセンス: KeyLang Original
The politician tried to cross the Rubicon by announcing his controversial policy, recognizing that the decision was irrevocable and would fundamentally alter his relationship with supporters who felt betrayed.
政治家は論争的な政策を発表することによってルビコン川を渡ろうとした(取り返しのつかない決断をした)。決定が取り消せず、裏切られたと感じる支持者との関係を根本的に変えることを認識していた。
Pronunciation data from ipa-dict (MIT License) based on cmudict-ipa by @lingz