an expert swimmer employed, as at a beach or pool, to protect bathers from drowning or other accidents and dangers.
verb (used without object)
to work as a lifeguard.

1640–50; life + guard Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lifeguard (ˈlaɪfˌɡɑːd)
Also called: life-saver a person present at a beach or pool to guard people against the risk of drowning

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1648, "bodyguard of soldiers," from Ger. leibgarde. Sense of "person paid to watch over bathers" is from 1896.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Lifeguard towers are often painted bright colors, making them more visible from
  the water.
The park also has restrooms and a lifeguard stand, making it the perfect spot
  for families to spend the day snorkeling.
There is a lifeguard at this beach, which is handicapped-accessible.
Bobby, pretending to be an exchange lifeguard, is soon accepted among the
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