carry/take coals to Newcastle

British

to take something to a place or a person that has a lot of that thing already.

Exporting pine to Scandinavia is a bit like carrying coals to Newcastle.

• moment of truth
• Monday morning quarterback
• Money doesn't grow on trees.
• Money is no object.
• money is no object
• Money no object.
• money-spinner
• money talks
• Money talks.
• monkey around with
• monkey around with something
• monkey business
• monkey on back
• monkey on someone's back
• monkey on your back
• monkey with
• monkey with something
• monopoly money
• month after month
• month by month
• months on end
• mop up
• mop up someone
• mop up something
• more and more