teach grandma how to suck eggs

Etymology
First attested circa 18th century, from Spanish.

Verb

 * 1)  To tell an expert how to do things.

Translations

 * Bulgarian: прода́вам кра́ставици на краставича́р
 * Chinese:
 * Mandarin:
 * Finnish: älä opeta isääsi naimaan, älä opeta isääsi kusemaan
 * French: apprendre à un vieux singe à faire des grimaces
 * Greek: έλα παππού μου, να σου δείξω τ' αμπελοχώραφά σου
 * Italian:
 * Japanese:, 釈迦に経
 * Kazakh: дария жанынан құдық қазба
 * Kikuyu: tiga kuonia ngarĩ kũhaica mũtĩ
 * Polish: uczyć ojca dzieci robić
 * Portuguese: ensinar a missa ao padre, ensinar a missa ao vigário
 * Russian: учи́ть орла́ лета́ть, учи́ть учёного
 * Scottish Gaelic: ionnsaich do sheanmhair lit' a dhèanamh
 * Spanish: dar clases a tu maestro
 * Thai:
 * Thai: สอนจระเข้ว่ายน้ำ
 * Vietnamese: