Even a worm will turn.

甚至蠕虫也会翻身;狗急跳墙.

He used to bully his secretary without mercy, but even a worm will turn and one day she walked out and left her job without even saying goodbye.

地欺侮他的秘书，但是如被逼太甚，最温顺者也会反抗的，结果有一天她不辞而别了。