fair's fair

Từ điển Oxford Advanced Learner 8th

fair's ˈfair idiom
(informal) (BrE also fair ˈdos/ˈdo's)used, especially as an exclamation, to say that you think that an action, decision, etc. is acceptable and appropriate because it means that everyone will be treated fairly
•Fair's fair— you can't expect them to cancel everything just because you can't make it.
•Come one, fair dos— you've had your chance, now let me try.
Main entry: ↑fair_idiom