noun:the part of a building that is entirely or partly below the ground
noun:the part of a building that is wholly or partly below ground level
Examples
worthless 'bargain-basement' products
I paid a 'bargain-basement' price.
Movie quotes
(..) Adam. Left. Right. Left. Left. - Right. Right. Left. - Take them to the lower level. - In the basement? - Do it, then return. - Left. A. - But... - Right. A. - I said, do it. (..)