the die is cast; there is no going back
Idiomatic expression equivalent to Latin 'alea iacta est', used when an irrevocable decision has been made.
I submitted my resignation. The die is cast.
There's no turning back now. The die has been cast.
Standard kanji form using 賽 (dice).
Variant using 采, a less common character for dice.
Calque of Latin 'alea iacta est', attributed to Julius Caesar. The Japanese phrase uses 賽 (dice) and the passive form of 投げる (to throw).