ɛkˈstɛnd pɹoʊˈlɔŋ pɹəʊˈlɒŋ pɹəˈtɹakt səˈsteɪn lengthen in time; cause to be or last longer We prolonged our stay She extended her visit by another day The meeting was drawn out until midnight lengthen or extend in duration or space We sustained the diplomatic negotiations as long as possible prolong the treatment of the patient keep up the good work