1. an anchored float used as a marker or as a mooring. 2. life buoy. 3. to keep afloat; keep from sinking (often fol. by up). 4. to mark with buoys. 5. to sustain or encourage (often fol. by up): Her courage was buoyed by the doctor's assurances. 6. to float or rise by reason of lightness. More @Wikipedia
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