life buoy

noun
any of variously formed buoyant devices for supporting a person fallen into the water.
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World English Dictionary
life buoy
 
n
any of various kinds of buoyant device for keeping people afloat in an emergency

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
One ring life buoy must be placed on a suitable rack on each side of a manned platform in an accessible place.
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