the die is cast
From games of chance in which the outcome is determined by the throwing of dice or a single die. Popularized by its use by Julius Caesar when he crossed the Rubicon to begin a civil war in the Roman Republic, indicating the commission of an irreversible act, whence also cross the Rubicon.
The form “the die is cast” is from the Latin iacta alea est, a grammatically incorrect translation by Suetonius, 121 CE, of the Ancient Greek phrase of Menander "Ἀνερρίφθω κύβος (Anerrhíphthō kúbos)", which Caesar quoted in Greek (not Latin). The Greek translates rather as “let the die be cast!”, or “Let the game be ventured!”
- Caesar: ... "Iacta alea est", inquit.
- Caesar said ... "the die is cast".
- Ἑλληνιστὶ πρὸς τοὺς παρόντας ἐκβοήσας, "Ἀνερρίφθω κύβος", διεβίβαζε τὸν στρατόν.
- He [Caesar] declared in Greek with loud voice to those who were present ‘Let the die be cast’ and led the army across.
- (idiomatic) The future is determined; there are no more options; events will proceed in an irreversible manner; the point of no return has been passed.