Buoy, v. t. [imp. & p. p. Buoyed p. pr. & vb. n. Buoying.]
 1. To keep from sinking in a fluid, as in water or air; to keep afloat; -- with up.
 2. To support or sustain; to preserve from sinking into ruin or despondency.
    Those old prejudices, which buoy up the ponderous mass of his nobility, wealth, and title.   --Burke.
 3. To fix buoys to; to mark by a buoy or by buoys; as, to buoy an anchor; to buoy or buoy off a channel.
    Not one rock near the surface was discovered which was not buoyed by this floating weed.   --Darwin.