Fair's fair American informal slang
Used to say that somebody should do or accept something in reality, or assert that an arrangement is appropriate because it's fair enough for all
Fair's fair. I cook the dinner, and you wash the dishes. Come on! Don't be that lazy.
I cleaned the house yesterday and today it's your turn. Fair's fair, right?
Equal condition to everyone.
1. It is fair that everyone has the chance to do something.
2. It is fair for someone to experience the suffering that they have caused others.
This tautological phrase usually used as a plea for fair play, without bias or advantage to one party or another, dates from the late 19th century. The OED cites 1898 as its first appearance in print.