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lifesaver

noun
     
Related topics: Swimming
life‧sav‧er [countable]
1 someone 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 seatbelt is the biggest single lifesaver in cars.
3DSS a life guard

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