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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 danger Navigation 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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