teach grandma how to suck eggs in Russian
teach grandma how to suck eggs in Russian
учи́ть орла́ лета́ть
(idiomatic, chiefly in the negative) To tell an expert how to do things.
учи́ть отца́ еба́ться
(idiomatic, chiefly in the negative) To tell an expert how to do things.
учи́ть учёного
(idiomatic, chiefly in the negative) To tell an expert how to do things.