Definition of 窮鼠猫を噛む
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(exp) a cornered rat will bite a cat; despair turns cowards courageous
「そんなに舐められた相手じゃないけどなぁ・・・」「そうだよ、窮鼠猫を噛むって言うじゃないか」
"I don't think she's an opponent you can ignore like that ..." "That's right, they say a cornered rat bites back, don't they?"