1. Nautical. a distinctively shaped and marked float, sometimes carrying a signal or signals, anchored to mark a channel, anchorage, navigational hazard, etc., or to provide a mooring place away from the shore.
2. a life bouy
3. to keep afloat or support by or as if by a life bouy; keep from sinking (often followed by up):
The life jacket buoyed her up until help arrived.
4. Nautical. to mark with a buoy or buoys.
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