underpin

[ uhn-der-pin ]

/ ˌʌn dərˈpɪn /

to prop up or support from below; strengthen, as by reinforcing a foundation.

to replace or strengthen the foundation of (a building or the like).

to furnish a foundation for; corroborate: The author's conclusions are underpinned by references to experimental findings.

Origin of underpin

First recorded in 1515–25; under- + pin

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?

Dictionary of Quotations from Ancient and Modern, English and Foreign Sources |James Wood
There were laws upon laws, endeavours to underpin the framework of a decaying society.

Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 8 |Various

They found the hole in which Mrs. Higgs had stepped, and the pole which had been used to underpin the middle boards.

The Wharf by the Docks |Florence Warden
I resumed: Further we must underpin the runners and work up the earth herring-wise.

The Mercy of Allah |Hilaire Belloc

underpin

/ (ˌʌndəˈpɪn) /

to support from beneath, esp by a prop, while avoiding damaging or weakening the superstructure to underpin a wall

to give corroboration, strength, or support to