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life jacket

noun
  1. a sleeveless jacket of buoyant or inflatable construction, for supporting the wearer in deep water and preventing drowning.
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Origin of life jacket

First recorded in 1865–70
Also called life vest; British, air jacket.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for lifejacket

life jacket

noun
  1. an inflatable sleeveless jacket worn to keep a person afloat when in danger of drowning
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012