Definitions from Wiktionary (lifeguard)

▸ noun:  A lifesaver: a rescuer, usually an expert swimmer, employed to save swimmers in trouble or near drowning at a body of water.
▸ noun:  (uncommon) A bodyguard or unit of bodyguards, a guard of someone's (especially a king's) life or person.
▸ noun:  (rail transport) A sturdy metal bracket fixed in front of each of the leading wheels of a train to deflect small objects away from the wheels to prevent derailment.
▸ Also see lifeguard

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