substantiate

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

represent in bodily form; "He embodies all that is evil wrong with the system"; "The painting substantiates the feelings of the artist"

make real or concrete; give reality or substance to; "our ideas must be substantiated into actions"

solidify, firm, or strengthen; "The president's trip will substantiate good relations with the former enemy country"