n. & v.
--n.
1. an anchored float serving as a navigation mark or to show reefs etc.
2 a lifebuoy.
--v.tr.
1. (usu. foll. by up) a keep afloat. b sustain the courage or spirits of (a person etc.); uplift, encourage.
2 (often foll. by out) mark with a buoy or buoys.
Etymology: ME prob. f. MDu. bo(e)ye, ult. f. L boia collar f. Gk boeiai ox-hides