( saying ) used to say that you should punish sb by doing to them what they have done to you or to sb else
AN EYE FOR AN EYE (AND A TOOTH FOR A TOOTH)
Meaning of AN EYE FOR AN EYE (AND A TOOTH FOR A TOOTH) in English
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005