Other forms: groundworks
Groundwork is the preparatory work everything else is built on. Lay the groundwork, the groundwork is done, do the groundwork first.
It almost always appears as lay the groundwork, and the point of the phrase is that the work is invisible in the result. In building, groundwork is the literal trade of foundations and drains before anything rises.
1noungroundworkThe preparatory work everything else is built on.
“Months of careful groundwork went into planning the expedition.”
groundwork is a preparation.
Ground plus work, from the foundation laid under a building.
From ground + work.
Etymology from Wiktionary, CC BY-SA