teach grandma how to suck eggs

English

First attested circa 18th century, from Spanish.

teach an expert

Bulgarian: продавам краставици на краставичар (prodávam krástavici na krastavičár, to sell cucumbers to a cucumber vendor)
Chinese:
Mandarin: 班門弄斧 (zh), 班门弄斧 (zh) (bānménnòngfǔ)
Finnish: opettaa ankanpoika uimaan (to teach a duckling to swim)
French: les oisons veulent mener les oies paître (the goslings want to drive the geese to pasture)
Greek: έλα παππού μου, να σου δείξω τ' αμπελοχώραφά σου (éla pappoú mou, na sou deíxo t' ampelochórafá sou) (come grandpa, I'll show you your vineyards)
Italian: please add this translation if you can

Polish: uczyć ojca dzieci robić
Portuguese: ensinar a missa ao padre, ensinar a missa ao vigário
Scottish Gaelic: ionnsaich do sheanmhair lit' a dhèanamh (teach grandmother make porridge)
Spanish: dar clases a tu maestro
Thai: สอนจระเข้ว่ายน้ำ (sŏn jàràkây wâai náam, teach a crocodile to swim)
Vietnamese: múa rìu qua mắt thợ (vi) (to wave one's axe before an axeman)

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