life jacket

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WordReference Random House Learner's Dictionary of American English © 2016
ˈlife ˌjack•et, n. [countable]
  • Naval Termsa life preserver in the form of a sleeveless jacket.
  • Also called ˈlife ˌvest. lifevest
    WordReference Random House Unabridged Dictionary of American English © 2016
    life jack′et, 
  • Nautical, Naval Termsa sleeveless jacket of buoyant or inflatable construction, for supporting the wearer in deep water and preventing drowning. Also called life vest;
     [Brit.,]air jacket. 
  • Etymology:1865–70

    Collins Concise English Dictionary © HarperCollins Publishers::

    life jacket n
    1. an inflatable sleeveless jacket worn to keep a person afloat when in danger of drowning

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