(UK, informal, derogatory) An extensive luxurious basement added to a home to avoid the difficulties of building an extension above ground.
According to Joe Gamp, a journalist for Express, Britons have complained about the palace's plan to build a two-story iceberg basement.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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