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English definition of “buoy”

buoy

noun [C]     /bɔɪ/ US  /ˈbuː.i/
a floating object on the top of the sea, used for directing ships and warning them of possible dangerNavigation and shipwrecksBoats and sailing craftPassenger, cargo and military ships
(Definition of buoy noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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