life preserver

noun

🔊/ˈlaɪf prɪzɜːvə(r)/

🔊/ˈlaɪf prɪzɜːrvər/

(North American English)

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a piece of material that floats well, often in the shape of a ring, or a jacket made of such material, used to rescue a person who has fallen into water, by keeping them above water救生用具