Meaning of the word "carry coals to Newcastle" in English

What does "carry coals to Newcastle" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

carry coals to Newcastle

US /ˈkæri koʊlz tu ˈnjuːˌkæsəl/
UK /ˈkæri koʊlz tu ˈnjuːˌkæsəl/
"carry coals to Newcastle" picture

Idiom

1.

to do something that is unnecessary because there is already a lot of it available

Example:
Bringing more blankets to the shelter would be like carrying coals to Newcastle; they already have plenty.
Offering him advice on coding is like carrying coals to Newcastle; he's a renowned expert.
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