DON'T TEACH YOUR GRANDMOTHER HOW TO SUCK EGGS


Meaning of DON'T TEACH YOUR GRANDMOTHER HOW TO SUCK EGGS in English

do not tell me what I know, do not say what is obvious

You, a history major, telling me, a war veteran, about war? Don't teach your grandmother how to suck eggs!

Wayne Magnuson. English idioms vocabulary.      Словарь английских идиом.