"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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