Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of underbuilding is as below...

Substructure :: Substruction (n.) Underbuilding; the foundation, or any preliminary structure intended to raise the lower floor or basement of a building above the natural level of the ground..

Underbuilding :: Underbuilding (n.) Same as Substruction.

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