iceberg basement

English

Etymology

So called because the greater part of an iceberg remains below sea level.

Noun

iceberg basement (plural iceberg basements)

1. (UK, informal, derogatory) An extensive luxurious basement added to a home to avoid the difficulties of building an extension above ground.
   • 2018 June 26, “Prince William, Kate Middleton's 'Ridiculous' Basement Expansion Sparks Debate”, in International Business Times:

     According to Joe Gamp, a journalist for Express, Britons have complained about the palace's plan to build a two-story iceberg basement.