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- teach grandmother to suck eggs
teach grandmother to suck eggs
teach one's grandmother to suck eggs
Fig. to try to tell or show someone more knowledgeable or experienced than oneself how to do something. Don't suggest showing Mary how to knit. It will be like teaching your grandmother to suck eggs. Don't teach your grandmother to suck eggs. Bob has been playing tennis for years.
teach your grandmother to suck eggs
(British & Australian) to give advice to someone about a subject that they already know more about than you You're teaching your grandmother to suck eggs, Ted. I've been playing this game since before you were born!