Definition
That is fair, good, or reasonable; one cannot hope for a better decision or outcome.
Origins
An informal way of expressing that one cannot say that anything is better or more fair than the matter being evaluated.
Idiom Breakdown
you can't say fairer than that
//juː ˈkɑːnt seɪ ˈfɛəɹə ðn̩ ˌðæt/ / /ju ˈkænt seɪ ˈfɛəɹəɹ ðən ˌðæt// BRITISHINFORMAL British EnglishEnglish pro-sentencesEnglish sentences