prolong

英[prə'lɒŋ] 美[prəˈlɑːŋ]

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"

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"