buoy

fe’l verb

1. To mark with a buoy. to buoy an anchor; to buoy or buoy off a channel
2. To maintain or enhance enthusiasm or confidence; to lift the spirits of. Buoyed by the huge success, they announced two other projects.
3. To keep afloat or aloft; used with up.
4. To support or maintain at a high level.

ot noun

1. A float moored in water to mark a location, warn of danger, or indicate a navigational channel.
2. A life-buoy; a life preserver.