Definition of "underbuilding" [un•der•build•ing]

• A substructure; foundation; infrastructure. (noun)

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• "By now, massive underbuilding during the slump far exceeds the overbuilding during the boom."
• "CityUnslicker said ... massive underbuilding due to planning regs is a key factor."
• "How do they avoid underbuilding or overbuilding the dams and reservoirs?"