teach grandmother to suck eggs


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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.
See also: egg, grandmother, suck, teach

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!
See also: egg, grandmother, suck, teach