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1. A float attached by rope to the seabed to mark channels in a harbour or underwater hazards; typically brightly-coloured

1. Float on the surface of water
    
2. Keep afloat
   "The life vest buoyed him up";
   - buoy up
    
3. Mark with a buoy

Sounds like: boy

Derived forms: buoyed, buoying, buoys

Type of: float, hold, hold up, mark, point of reference, reference, reference point, support, sustain, swim

Encyclopedia: Buoy