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- teach (one's) grandmother to suck eggs
teach (one's) grandmother to suck eggs
teach (one's) grandmother to suck eggs
To try to teach an older person who is wiser and more experienced and wordly than a young person may think. Why are you explaining basic typing to Ethel? Yes, she's 70, but she's been using a computer since before you were born—quit teaching your grandmother to suck eggs.