base [based, basing, bases](have as its foundation or starting point) verb [UK: beɪs] [US: ˈbeɪs]
vouch [vouched, vouching, vouches](to cite or rely on (an authority, written works, etc.) in support of one's actions or opinions) verb [UK: vaʊtʃ] [US: ˈvaʊtʃ]