Etymology
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lifeguard (n.)

also life-guard, 1640s, "a British monarch's bodyguard of soldiers," from life (n.) + guard (n.), translating German Leibgarde. Sense of "person paid to watch over bathers" is by 1891.

updated on July 05, 2016

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Definitions of lifeguard from WordNet

lifeguard (n.)
an attendant employed at a beach or pool to protect swimmers from accidents;
Synonyms: lifesaver
From wordnet.princeton.edu, not affiliated with etymonline.