From Longman Dictionary of Contemporary Englishlifesaverlife‧sav‧er /ˈlaɪfseɪvə $ -ər/ noun [countable] 1 HELPsomeone or something that helps you avoid a difficult or unpleasant situation A microwave oven can be a real lifesaver when you’re pressed for time.2 someone or something that prevents you from dying The seat belt is the biggest single lifesaver in cars.3 DSSa lifeguard
Examples from the Corpus
lifesaver• His benefits as the spouse of an airline employee would be a lifesaver.• The company's day care service has been a lifesaver for many parents.• He kicked off, towing his burden like a lifesaver.• DeCicco calls the operation a lifesaver.• Surely such a conscientious accomplishment should prove a lifesaver for thousands of animals throughout the world.• Another lifesaver, BobWestcott, remained on duty at the station, but watched through his telescope.• This led into a couple of summers acting as a professional lifesaver during summer vacations from Sheffield University.• The camaraderie was a psychic lifesaver.• The seat belt is the biggest single lifesaver in cars. 