不当家不知柴米贵

bù dāng jiā bù zhī chái mǐ guì

a person who doesn't manage a household would not be aware how expensive it is (idiom)

no; not so

dāng

to be

jiā

home

no; not so

zhī

to know

chái

firewood

uncooked rice

guì

abbr. for Guizhou Province 貴州|贵州[Gui4 zhou1]