窮きゅう鼠そ噛ごう猫びょう

Meanings

1

a cornered rat will bite the cat; desperate people fight back fiercely

yojijukugo (four-character idiom)

A yojijukugo proverb meaning that even the weak will fight back desperately when cornered. Often used to warn against pushing someone too far.

See also: 窮鼠猫を噛む

彼かれをあまり追おい詰つめると、窮きゅう鼠そ噛ごう猫びょうで何なにをするかわからないよ。
If you corner him too much, he might do anything—a cornered rat will bite the cat.