noun
a floating object that is anchored in a body of water to mark a location or guide navigation
verb
to keep afloat or support by means of a buoy
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The buoy marked the entrance to the harbor for incoming ships.
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Make sure to steer clear of that buoy when you're out on the water.
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I almost crashed into that buoy, it came out of nowhere!
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Her positive attitude acted as a buoy during difficult times.