life jacket
/ˈlɑɪf ˌdʒæk·ɪt/ n [C] (also life vest /ˈlɑɪf ˌvest/)Definition
› 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 n from the Cambridge Academic Content Dictionary
© Cambridge University Press)
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