酔い醒めの水下戸知らず
also: えいさめのみずげこしらず
Meanings
1
a teetotaler doesn't know how good water tastes after drinking
Proverb meaning that someone who never drinks cannot appreciate the relief or pleasure that water brings to a hungover person; used to say that you cannot understand something without experiencing it.
As the proverb goes, 'A teetotaler doesn't know how good water tastes after drinking' — you can't appreciate something without experiencing it.