1.  underpin(v = verb.contact) - support from beneath;
is one way to hold, hold up, support, sustain
Sample sentences: Something ----s something

2.  underpin(v = verb.stative) bear out, corroborate, support - support with evidence or authority or make more certain or confirm; "The stories and claims were born out by the evidence"
is one way to agree, check, correspond, fit, gibe, jibe, match, tally
Sample sentences: Somebody ----s something; Something ----s something

1.  To lay stones, masonry, etc., under, as the sills of a building, on which it is to rest. [1913 Webster]

2.  To support by some solid foundation; to place something underneath for support. [1913 Webster]

underpin, v.tr. (-pinned, -pinning)
1 support from below with masonry etc.
2 support, strengthen.