Definition of sub-basement in English:
A storey below a basement.
- Basically, it outlined that there was a sub-basement far below where they had been that was the actual control center.
- Somehow, he had wandered into the lower part of the James mansion, the sub-basement.
- The finance department will move into the sub-basement of Needles Hall, where co-op used to be.
Definition of sub-basement in:
- US English dictionary
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