corroborate

(verb) establish or strengthen as with new evidence or facts. Synonyms: confirm, sustain, substantiate, support, affirm. Examples: "His story confirmed my doubts." "The evidence supports the defendant."

(verb) give evidence for. Synonyms: validate.

(verb) support with evidence or authority or make more certain or confirm. Synonyms: underpin, bear out, support. Examples: "The stories and claims were born out by the evidence."