overspan UK /ˌəʊvəˈspæn/US /ˌoʊvɚˈspæn/ verb1 •To reach or extend over.The place for the fuel is carried up strait on both sides, till about three feet high ; then they almost fill it with wood, and over that lay a covering of sea-coal, and then overspan the arch[…] — 1763 formsoverspanned · overspanning · overspans