teach grandma how to suck eggs

动词 v.

英文释义

动词 v.
  1. To tell an expert how to do things. idiomatic
    — Madam, reply’d Joler, you would have me teach my Grandame to ſuck Eggs, or ſet up for a Lent Preacher.

词源

First attested circa 18th century, from Spanish: see quotation.
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