life-saver

noun

1. the saver of a person's life
2. another name for lifeguard
3. informal.
   a person or thing that gives help in time of need

Example Sentences

While the rollout is undoubtedly a relief and a life-saver, its relatively low efficacy rate means that it is not a "silver bullet", argues Willis Akhwale at End Malaria Council Kenya.

From BBC

For Mr. Bennett, who has been connected to machines to substitute for his heart and lungs for over six weeks, the new surgery is a life-saver.

From NewsForKids.net

Salcombe Dairy is near a park-and-ride drop off, which is a life-saver for many because the town's few car parks often resemble the Boxing Day sales.

From BBC

The original “Green Book” was a literal life-saver for Black travelers.

From Slate

A lawyer for the family, Andrew Tutt, told the court that a Section 1983 lawsuit was the family’s “last resort” and that it is a “life-saver for people who cannot actually make effective use” of administrative remedies in the law.

From Seattle Times