buttress [buttressed, buttressing, buttresses](support something or someone by supplying evidence) verb [UK: ˈbʌ.trəs] [US: ˈbʌ.trəs]
corroborate [corroborated, corroborating, corroborates](To confirm or support with additional evidence) verb [UK: kə.ˈrɒ.bə.reɪt] [US: kə.ˈrɑː.bə.ˌret]