Corroborate

1. verb

   support with evidence or authority or make more certain or confirm

   “The stories and claims were born out by the evidence”

   Similar: underpin, bear out, support

2. verb

   establish or strengthen as with new evidence or facts

   “his story confirmed my doubts”

   Similar: confirm, sustain, substantiate, support, affirm

3. verb

   give evidence for

   Similar: validate