The phrase "absolute lifesaver" refers to someone or something that has provided great help or assistance in a critical or urgent situation. Full definition
I don't have the time (nor energy or inclination) to whip up my more complicated meals save for holidays and special occasions, so your recipes have been an absolute lifesaver. (deliciouslyella.com)
I can not wait to try this, and am sure it will be an absolute lifesaver to have on hand for those lovely 3 am feedings Thank you sooooooo much for joining in on the celebration for our sweet baby boy, Brianna! (flippindelicious.com)