无法回头的路；绝路。喻指犯罪道路或没有其他选择、只能这样走下去的道路to turn to a life of crime or be forced into one path of action

• 被捕后,郑立在看守所感叹:“我知道这是一条不归路”。

  ”I knew there was no way back,” said Zhengli in the detention house after his arrest.

• 15年的铁窗生活，也会有足够的时间让她细细地回味和琢磨是如何由此走上不归路的。

  15 years in prison should be enough for her to thoroughly reflect on what turned her to a life of crime.