Eye for eye is a phrase that originated from the ancient legal code of Hammurabi, which stated that if someone caused harm to another person, they would receive the same punishment in return. However, there are several synonyms for this phrase, including "retribution," "payback," "vengeance," and "tit-for-tat." Retribution refers to punishment that is inflicted in response to an offense. Payback implies a response to an injury or wrongdoing with an equally harmful action. Vengeance suggests a passionate desire for revenge, while tit-for-tat refers to an equal or reciprocal exchange of punishment or favor. These synonyms all encapsulate the idea of justice being served by meting out punishment that is commensurate with the offense.