like taking coals to Newcastle

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take coals to Newcastle

To do something redundant, frivolous, or unnecessary. Newcastle was once a major coal supplier. We definitely don't need to bring any toys when we go over their house—they have so many that bringing more would be like taking coals to Newcastle.
See also: coal, Newcastle, take, to
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

like taking coals to Newcastle

or

like carrying coals to Newcastle

If you describe an action as being like taking coals to Newcastle or like carrying coals to Newcastle, you mean that you are giving things to someone or something that already has plenty of that thing. Sending guns to this region would be like taking coals to Newcastle. Note: You can also say that an action is like selling coals to Newcastle or simply talk about coals to Newcastle. Selling order and tidiness to Germans sounds like selling coals to Newcastle. More clothes for Nicola? Talk about coals to Newcastle! Note: You can also talk about a coals-to-Newcastle situation. Selling technology of this sort to Japan might seem a coals-to-Newcastle affair. Note: The city of Newcastle was the main centre of England's coal-mining industry for over 150 years.
See also: coal, like, Newcastle, taking, to
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
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References in periodicals archive ?
Now two local historians - Nick Neave and Colin Douglas - have written Like Carrying Coals To Newcastle, the Story of the Tanfield Way, which tells of the transport link.