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

1.
无法回头, 不归路
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.
一旦我们发射火箭,就过了无法回头的地步。
•
After signing the contract, there was no turning back; we had reached the point of no return.
签署合同后,就没有回头路了;我们已经达到了无法回头的地步。