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A life preserver.
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|Noun||1.||flotation device - rescue equipment consisting of a buoyant belt or jacket to keep a person from drowning|
float - something that floats on the surface of water
life buoy, life ring, lifesaver, life belt - a life preserver in the form of a ring of buoyant material
cork jacket, life jacket, life vest - life preserver consisting of a sleeveless jacket of buoyant or inflatable design
rescue equipment - equipment used to rescue passengers in case of emergency
water wings - a life preserver consisting of a connected pair of inflatable bags that fit under a person's arms and provide buoyancy; used by children learning to swim