WordReference Random House Learner's Dictionary of American English © 2014
ˈlife ˌjack•et, n. [countable]
a life preserver in the form of a sleeveless jacket.
Also calledˈlife ˌvest. lifevest

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

'life jacket' also found in these entries:
In the English description:

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