lifesaver

[lahyf-sey-ver]
noun
1.
a person who rescues another from danger of death, especially from drowning.
2.
a person or thing that saves a person, as from a difficult situation or critical moment: That money was a lifesaver.
3.
Chiefly British. a lifeguard.

Origin:
1880–85; life + saver

lifesaving, adjective, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
lifesaver

noun
1. an attendant employed at a beach or pool to protect swimmers from accidents [syn: lifeguard
2. a life preserver in the form of a ring of buoyant material [syn: life buoy
WordNet® 3.0, © 2006 by Princeton University.
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Example sentences
In any one individual screening for prostate cancer could be a lifesaver.
Knowing what to expect of yourself and how to identify heat illness can be a lifesaver.
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