Meaning of the word "the die is cast" in English

What does "the die is cast" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

the die is cast

US /ðə daɪ ɪz kæst/
UK /ðə daɪ ɪz kɑːst/
"the die is cast" picture

Idiom

an unchangeable decision has been made or an irreversible action has been taken

Example:
After submitting my resignation, I knew the die was cast and there was no turning back.
Once you sign the contract, the die is cast, and you're committed to the terms.