(sometimes derogatory) An adult who lives in their parents' house (stereotypically in their basement); often with implications of idleness or social awkwardness.

plural of basement-dweller

plural of iceberg basement

(UK, informal, derogatory) An extensive luxurious basement added to a home to avoid the difficulties of building an extension above ground.

(informal, derogatory) A nerd or geek; a person lacking a social life. / Used other than figuratively or idiomatically: see basement, dweller.

plural of basement dweller

Toward a basement.

plural of basementful

(housing) An apartment located below street level, underneath another structure, usually an apartment building, but sometimes under a house or a business.

plural of basement apartment