以毒攻毒

to use violence to curb violence

an eye for an eye (idiom); fig. to use the enemy's methods against him; to give sb a taste of his own medicine

an eye for an eye, a tooth for a tooth (idiom); fig. to use the enemy's methods against him

lit. use sb's spear to attack his shield (idiom, derived from Han Feizi 韓非子|韩非子); turning a weapon against its owner; fig. to attack an opponent using his own devices

to use an opponent's own methods to obtain retribution (idiom, from Song dynasty neo-Confucianist Zhu Xi 朱熹); to get revenge by playing sb back at his own game; to give sb a taste of his own medicine

a tooth for a tooth (retaliation)