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The Collaborative International Dictionary
Underbuilding

Underbuilding \Un"der*build`ing\, n. Same as Substruction.

Wiktionary
underbuilding

n. A substructure; foundation; infrastructure.

Usage examples of "underbuilding".

He conducted Forrester through underbuilding mazes and footbridges Forrester had not even seen, his mouth going all the while.

Forrester took five dollars from a pretty girl in a sort of mirror-bright bikini, then fifty from a man who had brought his pet animal—it was a little silk-furred monkey—down to the underbuilding park to run free, and who seemed to accept Forrester’s touch as a form of rent for the use of the premises.