What does the idiom "The die is cast" most accurately mean?

• The idiom "The die is cast" means - The outcome of a decision is now determined and cannot be changed.

• The die is cast (idiom)
English Meaning: Once a decision has been made, the consequences are inevitable, and there is no turning back.
Bangla Meaning: সিদ্ধান্ত নেওয়া হয়ে গেছে, এবং এর ফলাফল এখন নির্ধারিত, এটি আর পরিবর্তন করা যাবে না।

Example Sentence:
- Once he made the announcement, the die was cast, and there was no going back on his decision to resign.

Source:
1. Cambridge Dictionary.
2. Accessible Dictionary by Bangla Academy.