"buoy" in the noun sense
1. buoy
bright-colored a float attached by rope to the seabed to mark channels in a harbor or underwater hazards
"buoy" in the verb sense
1. buoy
float on the surface of water
2. buoy, buoy up
keep afloat
"The life vest buoyed him up"
3. buoy
mark with a buoy
Source: WordNet® (An amazing lexical database of English)
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