point of no return
US /pɔɪnt əv noʊ rɪˈtɜrn/
UK /pɔɪnt əv noʊ rɪˈtɜrn/

1.
無法回頭, 不歸路
the stage in a process when a decision or action cannot be changed or reversed
:
•
Once we launch the rocket, we've passed the point of no return.
一旦我們發射火箭,就過了無法回頭的地步。
•
After signing the contract, there was no turning back; we had reached the point of no return.
簽署合同後,就沒有回頭路了;我們已經達到了無法回頭的地步。