窮鼠猫を噛む。

tbd

A cornered rat will bite a cat.

あいつ追いつめられたら何するか分からないぞ。窮鼠猫を噛むってこともあるからな。気を付けるに越したことはない。

tbd

I wouldn't push him too far. You don't know what he might do. I'd say you can't be too careful. They say even a doomed mouse will bite a cat if he has no choice.