[v] support with evidence or authority : make more certain or confirm; "The stories and claims were born out by the evidence"
corroborate, support, underpin
affirm, afford support, attest, authenticate, back, back up, bear, bear up, bolster, bolster up, buttress, certify, circumstantiate, confirm, corroborate, crutch, document, finance, fortify, fund, give support, hold up, justify, keep, lend support, mainta