以毒攻毒 Fighting fire with fire
Explanation
中医用语，指用含有毒性的药物治疗毒疮等恶性病。比喻利用不良事物本身的矛盾来反对不良事物，或利用恶人来对付恶人。
A term from traditional Chinese medicine referring to the treatment of malignant diseases with poisonous substances. Figuratively, it means to utilize the inherent contradictions of a harmful element to counteract it, or to use one villain to defeat another.
Origin Story
从前，在一个偏远的山村里，爆发了一种怪病。这种病的症状十分奇怪，患者会全身发痒，皮肤溃烂，而且难以治愈。村里的郎中束手无策，村民们陷入了深深的恐慌之中。这时，一位云游四方的老中医来到了村里。他经过仔细观察和诊断后，发现这种怪病是由一种罕见的毒虫引起的。这种毒虫的毒性很强，一般的药物无法对抗。老中医沉思片刻，突然灵光一闪，他决定采用“以毒攻毒”的方法。他找到了一种与毒虫毒性相近的草药，并用它配置成药剂。这种药剂虽然也含有毒性，但可以抑制毒虫的毒性，并最终将毒虫杀死。经过一段时间的治疗，村民们的病情逐渐好转，最终痊愈。这个故事传遍了四方，也让人们对“以毒攻毒”有了新的认识。
Once upon a time, in a remote mountain village, a strange disease broke out. The symptoms were very unusual: patients experienced intense itching, skin sores, and the disease was difficult to cure. The village doctor was helpless, and the villagers were deeply terrified. Then, a wandering physician came to the village. After careful observation and diagnosis, he found that this disease was caused by a rare poisonous insect. The insect was highly toxic, and ordinary medicines were ineffective. The physician pondered for a moment, and suddenly had an idea: he decided to use the method of "fighting fire with fire." He found a herb with similar toxicity to the insect, and used it to prepare a medicine. This medicine, although also containing poison, could inhibit the poison of the insect and eventually kill it. After a period of treatment, the villagers' condition gradually improved, and eventually they were completely cured. This story spread far and wide, and gave people a new understanding of the method of "fighting fire with fire."
Usage
用于比喻运用某种事物或方法来对付与之性质相同或相近的事物或方法。
Used to illustrate the application of a thing or method to deal with things or methods of similar or the same nature.
Examples
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他用激将法来对付对手，真是以毒攻毒。
ta yong jijangfa lai duifu duishou,zhen shi yidu gongdu. mian dui wangluo baoli, ta xuanze yidu gongdu, yong tongyang defangshi huiji
He used aggressive tactics against his opponent, a case of fighting fire with fire.
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面对网络暴力，他选择以毒攻毒，用同样的方式回击。
In the face of cyberbullying, he fought back with the same methods.