to carry coals to Newcastle

英語での「 carry coals to Newcastle」の定義と意味

to carry coals to newcastle
01

余計なことをする, 無駄な労力をかける

to undertake something that is pointless
Dialectbritish flagBritish
to [carry|take] coals to Newcastle definition and meaning
idiom
old use
Trying to sell umbrellas on a rainy day in a place where there are many umbrella vendors is like taking coals to Newcastle - it's unnecessary and redundant.
プロの編集者に基礎文法を教えるなんて余計なことだ。
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