plural life jackets
: something that is worn over your upper body like a jacket or vest and that is designed to save you from drowning by holding you up when you are in water
called also (US) life vest
Cite this Entry
“Life jacket.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/life%20jacket. Accessed 16 Apr. 2026.
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