carry coals to Newcastle

Meaning: (idiomatic)To do something that isunneededorredundant.Synonym:bring owls to Athens1851,Herman Melville, chapter 81, inMoby-Dick‎[1]:However curious it may seem for an oil-ship to be borrowing oil on the whale-ground, and however much it may invertedly contradict the old proverb aboutcarrying coals to Newcastle, yet sometimes such a thing really happens; and in the present case Captain Derick De Deer did indubitably conduct a lamp-feeder as Flask did declare.1960,P. G. Wodehouse, chapter II, inJeeves in the Offing:He's the fellow who likes to let off stink bombs in night clubs, which rather falls under the head ofcarrying coals to Newcastle[…]

Examples:

EN: To teach English in England is to carry coals to Newcastle, and it's ill-paid.
ES: Enseñar inglés en Inglaterra es como llevar carbón a las minas de Newcastle y está muy mal pagado.
EN: Why did you carry coals to Newcastle in the first place?
ID: Kenapa tidak kamu serahkan sejak awal?

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