lifeguard

An expert swimmer trained and employed to watch over other swimmers, as at a beach or swimming pool.

To work or serve as a lifeguard.

A guard of the life or person; a guard that attends a prince or other person; a bodyguard.

An attendant, usually an expert swimmer, employed to save swimmers in trouble or near drowning at a body of water.

A lifesaver.

A sturdy metal bracket affixed in front of each of the leading wheels of a train to deflect small objects away from the wheels to prevent derailment.

an attendant employed at a beach or pool to protect swimmers from accidents