teaching grandma how to suck eggs

Verb

teach grandma how to suck eggs (third-person singular simple present teaches grandma how to suck eggs, present participle teaching grandma how to suck eggs, simple past and past participle taught grandma how to suck eggs)

1. (idiomatic) To tell an expert how to do things.
   • Madam, reply’d Joler, you would have me teach my Grandame to ſuck Eggs, or ſet up for a Lent Preacher.[1707, Francisco de Quevedo, translated by John Stevens, “The Dog and the Fever: An Unaccountable Novel: or, A Rapsody”, in The Comical Works of Don Francisco de Quevedo, […], London: […] John...