noun
a person or thing that saves someone's life, especially in a dangerous situation
adjective
describing something or someone that saves or protects lives
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The automated external defibrillator proved to be a lifesaver in the emergency situation.
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My friend who is a nurse turned out to be a real lifesaver when I got sick on vacation.
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That new app is a total lifesaver when it comes to finding the best deals online.
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Learning how to manage my time effectively has been a real lifesaver in my busy schedule.