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English definition of “life jacket”

life jacket

noun [C]  /ˈlɑɪf ˌdʒæk·ɪt/ (also life vest,  /ˈlɑɪf ˌvest/) us  
a piece of equipment that looks like a jacket without sleeves and that is filled with air or light material designed to help someone float if the person falls into the water
(Definition of life jacket from the Cambridge Academic Content Dictionary © Cambridge University Press)
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