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WordNet-Online 
 Definitions from WordNet
Noun life buoy has 1 sense 
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Definitions from the WebLife BuoyDefinition: A life buoy is a floating device used to provide support and safety to a person in the water, designed to be thrown or held onto while waiting for rescue. Examples:Noun: 
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life-sustaining life-the life-threatening life life  life assurance life belt life boat life buoy life changing life class life cycle life cycle costing life estate life eternal life expectancy life force
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