overdeal /ˌəʊvə(ɹ)ˈdiːl/verb 2/ˈəʊvə(ɹ)ˌdiːl/ noun 1forms 3 verb2 •To deal too much or too many (for example, playing cards) •To have too many dealings.Extended family issues (Mom overdeals with his family and Dad underdeals with his family). — 2003 overdeal /ˈəʊvə(ɹ)ˌdiːl/ noun1 •(no longer used) An amount left over; excess. formsoverdealt · overdealing · overdeals