Etymology: alteration of earlier tip for tap, from tip (blow) + for + tap Date: 1556 an equivalent given in return (as for an injury) ; retaliation in kind, tit-for-tat adjective
TIT FOR TAT
Meaning of TIT FOR TAT in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012