prolong

prolong (http://definr.com/prolong)

     v 1: 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" [syn: protract,
          extend, draw out]
     2: lengthen or extend in duration or space; "We sustained the
        diplomatic negociations as long as possible"; "prolong the
        treatment of the patient"; "keep up the good work" [syn: sustain,
         keep up]