lifeguard

[lahyf-gahrd]
verb (used without object)
  1. to work as a lifeguard.

Origin of lifeguard

First recorded in 1640–50; life + guard
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for lifeguard

lifeguard

noun
  1. a person present at a beach or pool to guard people against the risk of drowningAlso called: life-saver
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for lifeguard
n.

also life-guard, 1640s, "bodyguard of soldiers," from life (n.) + guard (n.), translating German leibgarde. Sense of "person paid to watch over bathers" is by 1896.

Online Etymology Dictionary, © 2010 Douglas Harper