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lifebuoy

noun

🔊/ˈlaɪfbɔɪ/

🔊/ˈlaɪfbuːi/, 🔊/ˈlaɪfbɔɪ/

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a piece of material that floats well, often in the shape of a ring, used to rescue somebody who has fallen into water, by keeping them above water救生带；救生圈