overbridge noun 1verb 1forms 3 noun1 •(UK) A bridge that allows traffic to pass over a road, river, railway etc.No major platform improvements have been possible in the past because the piers of an overbridge at the north end of the station prevented respacing of the tracks. — 1951 verb1 •To form a bridge over; to overarch. formsoverbridged · overbridging · overbridges