Jisho

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Noun
1. swim ring; swimming ring; life buoy; life belt; life preserver; lifesaver
Wikipedia definition
2. LifebuoyA lifebuoy, ring buoy, lifering, lifesaver, life preserver or lifebelt, also known as a "kisby ring" or "perry buoy", is a life saving buoy designed to be thrown to a person in the water, to provide buoyancy, to prevent drowning. Some modern lifebuoys are fitted with a seawater-activated light, or lights, to aid rescue at night. The lifebuoy usually is ring-shaped or horseshoe-shaped and has a connecting line allowing the casualty to be pulled to the rescuer.
Read “Lifebuoy” on English Wikipedia
Read “浮き輪” on Japanese Wikipedia
Read “Lifebuoy” on DBpedia
Other forms
浮輪 【うきわ】浮環 【うきわ】

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