Definition of lifebuoy noun from the Oxford Advanced Learner's Dictionary

 

lifebuoy

 noun
noun
BrE BrE//ˈlaɪfbɔɪ//
 
; NAmE NAmE//ˈlaɪfbɔɪ//
 
, also NAmE//ˈlaɪfbuːi//
 
 
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a piece of material that floats well, used to rescue somebody who has fallen into water, by keeping them above water
See the Oxford Advanced American Dictionary entry: lifebuoy