verb
justify, substantiate, authenticate, corroborate, testify, explain, attest, show, warrant, uphold, determine, settle, fix, certify, back, sustain, validate, bear out, affirm, confirm, make evident, convince, evidence, be evidence of, witness, declare, testify, betoken, have a case, manifest, demonstrate, document, establish, settle once and for all, (just) go to show*; see also verify.
Antonyms disprove*, break down, disqualify.