verb (used with object), un·der·pinned, un·der·pin·ning.
Examples from the Web for underpin
It is also their pattern to ignore the political problems that underpin the bad military performances of our “good guys.”Here's How to Dig Out of This 'Stupid Sh*t' U.S. Foreign Policy|Leslie H. Gelb|August 13, 2014|DAILY BEAST
There was a matter of underpinning for a start, but it costs money to underpin the west end of a cathedral.The Burglars' Club|Henry A. Hering
We underpin our houses with granite; what 30 of our habits and our lives?
There were laws upon laws, endeavours to underpin the framework of a decaying society.