life jacket

a sleeveless jacket of buoyant or inflatable construction, for supporting the wearer in deep water and preventing drowning.
Also called life vest; British, air jacket.

1865–70 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
life jacket
an inflatable sleeveless jacket worn to keep a person afloat when in danger of drowning

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
For the drill, you will need a life jacket, which will be either in your cabin
  or at the cruise ship's muster station.
If you are in a tandem kayak, make sure you have a life jacket for both of you.
Wear a life jacket and helmet if there are any rapids.
If you are able to walk, take the stairs to return your life jacket, and move
  on to your next destination.
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