Definition of sub-basement in English:

sub-basement

Syllabification: sub-base·ment

noun

A story below a basement.
More example sentences
  • 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.

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