prolong UK /pɹəʊˈlɒŋ/US /pɹoʊˈlɑŋ/ verb4 •To extend in space or length. •To lengthen in time; to extend the duration of.Complaining prolongs one’s pain. •To become longer; lengthen. •To put off to a distant time; to postpone.The government shouldn't prolong deciding on this issue any further. formsprolonged · prolonging · prolongeth · prolongs · prolongest