UNDERPINNED
UNDERPIN
underpin
(verb) support from beneath
corroborate, underpin, bear out, support
(verb) support with evidence or authority or make more certain or confirm; “The stories and claims were born out by the evidence”
Source: WordNet® 3.1
Verb
underpinned
simple past tense and past participle of underpin
Source: Wiktionary
UNDERPIN
Un`der*pin", v. t. [imp. & p. p. Underpinned; p. pr. & vb. n.
Underpinning.]
1. To lay stones, masonry, etc., under, as the sills of a building,
on which it is to rest.
2. To support by some solid foundation; to place something underneath
for support.
Source: Webster’s Unabridged Dictionary 1913 Edition