iceberg basement
nounEtymology So called because the greater part of an iceberg remains below sea level.
1
UK, Derogatory, Informal 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.2018 June 26, “Prince William, Kate Middleton's 'Ridiculous' Basement Expansion Sparks Debate”, in International Business Times: