the die is cast
决定已被做出，无法更改
书面·表达决定已定
英文释义
the decision is made and cannot be changed; the future or outcome is determined and cannot be altered
例句
I've already submitted my resignation—the die is cast.
典故来源
源自罗马历史学家苏埃托尼乌斯记载的凯撒名言，指渡过卢比孔河后决定已不可逆。