| ̷ ̷ ̷ ̷| ̷ ̷ transitive verb
Etymology: under (I) + pin
1. : to replace or strengthen the foundation of
underpin a sagging building
2. : to form part of the foundation of
underpinning wall
principles which should underpin a free society — Barbara Ward
3. : support , substantiate
underpin his thesis that American democracy is not an exportable commodity — V.O.Key
underpinned with thick footnotes — Newsweek
is this section of the play the acting is strongly underpinned by a script — E.R.Bentley