confirm, corroborate, sustain, substantiate, support, affirm

establish or strengthen as with new evidence or facts; "his story confirmed my doubts"; "The evidence supports the defendant"

• back, back up — establish as valid or genuine
• vouch — give supporting evidence
• verify — confirm the truth of
• prove, demonstrate, establish, show, shew — establish the validity of something, as by an example, explanation or experiment
• document — support with evidence
• validate — prove valid; show or confirm the validity of something