To maintain or enhance enthusiasm or confidence; to lift the spirits of.
To support or maintain at a high level.
To keep afloat or aloft; used with up.
To mark with a buoy.
A life-buoy; a life preserver.
A float moored in water to mark a location, warn of danger, indicate a navigational channel or for other purposes
To be courageous; to regain one's courage.
Used when encouraging someone to bear or take up a difficult situation.