cicerone
To show (somebody) the sights, acting as a tourist guide.
archaic
Accordingly, as three o'clock struck, six dashing-looking light dragoons were seen slowly sauntering up the dining-hall, escorted by Webber, who, in full academic costume, was leisurely ciceroning his friends and expatiating upon the excellences of the very remarkable portraits which graced the walls.
Where it comes from
1726, from Italian cicerone (surface analysis cicero + -one (augmentative)), from Latin Cicerōnem, form of Cicerō, agnomen of Marcus Tullius Cicero), the Roman orator, from cicer (“chickpea”) from Proto-Indo-European *ḱiker- (“pea”). Possibly humorous reference to loquaciousness of guides.
Adapted from the Wiktionary entry cicerone (CC BY-SA 4.0).