以眼还眼 an eye for an eye
Explanation
比喻用同样的方法回击对方。
It is a metaphor to fight back with the same methods.
Origin Story
从前，在一个小山村里，住着两个性格迥异的人。一个是老实巴交的农夫老张，另一个是心狠手辣的地痞流氓老王。老王经常欺负老张，抢夺他的庄稼，甚至殴打他。老张忍辱负重，总是默默忍受。有一天，老王变本加厉，不仅抢走了老张全部的收成，还将他打得遍体鳞伤。老张再也忍受不了了，他怒吼一声，拿起家中仅有的锄头，狠狠地还击了老王。这是他第一次反抗老王，也是他第一次以眼还眼，以牙还牙。老王的恶行最终得到了应有的惩罚，从此再也不敢欺压老张了。
Once upon a time, in a small mountain village, lived two people with different personalities. One was an honest farmer named Lao Zhang, the other was a ruthless gangster named Lao Wang. Lao Wang often bullied Lao Zhang, robbed his crops, and even beat him. Lao Zhang endured everything silently. One day, Lao Wang went even further. Not only did he steal all of Lao Zhang's harvest, but he also beat him up badly. Lao Zhang could no longer tolerate it. He roared and picked up the only hoe he had at home and hit Lao Wang back fiercely. This was his first time fighting back against Lao Wang, and it was the first time he had applied the principle of "an eye for an eye, a tooth for a tooth". Lao Wang's evil deeds were finally punished, and he never dared to bully Lao Zhang again.
Usage
多用于表达一种强硬的报复态度，强调以牙还牙。
It is often used to express a tough attitude of retaliation, emphasizing an eye for an eye.
Examples
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他以眼还眼，以牙还牙地报复了竞争对手。
ta yi yan huan yan, yi ya huan ya de baofu le jingzheng duishou.
He retaliated against his competitor with an eye for an eye, a tooth for a tooth.
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面对恶意竞争，公司决定以眼还眼，维护自身权益。
mian dui eyi jingzheng, gongsi jueding yi yan huan yan, weihu zishen quanyi
Faced with unfair competition, the company decided to fight back with the same means.