以眼还眼，以牙还牙 (以眼還眼，以牙還牙) yǐ yǎn hái yǎn, yǐ yá hái yá

yǐ yǎn hái yǎn, yǐ yá hái yá phrase an eye for an eye, a tooth for a tooth; to use the enemy's methods against him
Domain: Proverb 谚语
Notes: (CC-CEDICT '以眼還眼，以牙還牙')