1. a ring-shaped or horseshoe-shaped buoyant device thrown to a person in water to keep them afloat
Usage: also called life ring or life preserver; commonly found on ships and at swimming areas

Examples

• The sailor threw a lifebuoy to the swimmer struggling in the water.
• Every boat is required to carry lifebuoys for emergency situations.
• The lifeguard grabbed the lifebuoy and ran toward the drowning child.
• Lifebuoys are typically painted bright orange or red for visibility.
• The ship's crew practiced throwing lifebuoys during the safety drill.
• A lifebuoy was floating near the dock after the accident.