虎口逃生的英文：
[Literal Meaning]
tiger/mouth/escape/life
to survive from a tiger mouth

[解释]
从老虎嘴里幸存下来的生命。比喻从危险中逃出来侥幸活了下来。

[Explanation]
to survive a disaster

[例子]
战俘们挖了一条地道逃出了集中营，终于虎口逃生。

[Example]
The POWs escaped from the concentration camp by digging a tunnel and eventually survived a disaster.

[英文等价词]
a close shave