underpin

verbs

support from beneath
underpin
is a type of (narrower)
be the physical support of; carry the weight of
"The beam holds up the roof"; "He supported me with one hand while I balanced on the beam"; "What's holding that mirror?"
hold, hold up, support, sustain
support with evidence or authority or make more certain or confirm
"The stories and claims were born out by the evidence"
bear out, corroborate, support, underpin