To set up (a government, nation, business, etc.); found; institute
(Mathematics) The side or face of a geometric figure to which an altitude is or is thought to be drawn. The base can be, but is not always, the bottom part of the figure.
To develop or give form to according to a plan or process; create:
To touch or reach the ground.
To establish; settle
To make more certain the validity of; confirm; bolster; support
To assume and carry successfully, as the part of an actor; to represent or act; to sustain.
To rely; depend
Find another word for underpin. In this page you can discover 23 synonyms, antonyms, idiomatic expressions, and related words for underpin, like: establish, predicate, base, build, found, ground, root, over, corroborate, bear out and support.