Definition
This idiom is used to indicate that a decision or action has been taken, and the outcome is now inevitable and irreversible.
指事态已成定局，无法改变。
The moment he decided to resign, the die was cast, and no one could stop him.
在他决定辞职的那一刻，事已成定局，没有人能阻止他。
With the company declaring bankruptcy, the die was cast, and the employees began seeking new jobs.
随着公司宣布破产，事已成定局，员工们开始寻找新工作。
After she made the statement publicly, the die was cast; it was impossible for her to take back her words.
在她公开发表声明后，事已成定局；她不可能收回她的话。