Do or bring something superfluous or unnecessary.
Examples:
- Running the sprinkler while it's raining — that's carrying coals to Newcastle.
Origin: Already well known by mid-1500s; Newcastle-upon-Tyne had been a major coal-mining center for centuries
Do or bring something superfluous or unnecessary.
Examples:
Origin: Already well known by mid-1500s; Newcastle-upon-Tyne had been a major coal-mining center for centuries