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We found one dictionary with English definitions that includes the word teach grandma how to suck eggs:
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General (1 matching dictionary)

1. teach grandma_how_to_suck_eggs: Wiktionary [home, info]

Quick definitions from Wiktionary (teach grandma how to suck eggs) ▸ verb:  (idiomatic, chiefly in the negative) To tell an expert how to do things. ▸ Words similar to teach grandma how to suck eggs ▸ Usage examples for teach grandma how to suck eggs ▸ Idioms related to teach grandma how to suck eggs (New!) ▸ Words that often appear near teach grandma how to suck eggs ▸ Rhymes of teach grandma how to suck eggs ▸ Invented words related to teach grandma how to suck eggs