Main entry: prolong, protract, extend, draw out
Definition: lengthen in time; cause to be or last longer
Usage: We prolonged our stay; She extended her visit by another day; The meeting was drawn out until midnight
Main entry: prolong, keep up, sustain
Definition: lengthen or extend in duration or space
Usage: We sustained the diplomatic negotiations as long as possible; prolong the treatment of the patient; keep up the good work