1. buoy - noun
· bright-colored; a float attached by rope to the seabed to mark channels in a harbor or underwater hazards
Hypernym(s): reference_point, point_of_reference, reference
2. buoy - verb
· float on the surface of water
3. buoy - verb
· keep afloat; "The life vest buoyed him up"
Synonym(s): buoy_up
Hypernym(s): hold, support, sustain, hold_up
4. buoy - verb
· mark with a buoy
Hypernym(s): mark
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