The story
From underbuild (“to build beneath, lay a foundation for”), equivalent to underbuild + -ing.
Etymology from Wiktionary, CC BY-SA 4.0.
underbuilding
Today it means: A substructure; foundation; infrastructure. Full definition →
Today it means: A substructure; foundation; infrastructure. Full definition →
From underbuild (“to build beneath, lay a foundation for”), equivalent to underbuild + -ing.
Etymology from Wiktionary, CC BY-SA 4.0.