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English definition of “teach your grandmother to suck eggs”

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teach your grandmother to suck eggs

UK disapproving
to give advice to someone about a subject that they already know more about than you
Translations of “teach your grandmother to suck eggs”
in Chinese (Traditional) 班門弄斧…
in Chinese (Simplified) 班门弄斧…
(Definition of teach your grandmother to suck eggs from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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