яйки курицу не учат, яйки бизнес крутят

Etymology
lit. 'the eggs do not teach the hen, the eggs do business'. Expansion of.

Pronunciation
Ipa(key): [ˈjæjkʲi ˈkurʲɪt͡sʊ nʲɪ‿ˈut͡ɕɪt ˈjæjkʲi ˈbʲiznɨs ˈkrutʲət]

Proverb

 * 1) ) don't teach your grandmother to suck eggs