ブイ

noun

buoy; floating marker

A floating object anchored in water to mark a location, warn of hazards, or indicate a mooring point.

See also: 浮標

• 港みなとの入いり口ぐちに赤あかいブイが浮うかんでいる。

  A red buoy is floating at the harbor entrance.

noun

lifebuoy; life ring

A ring-shaped or similar flotation device thrown to a person in the water to prevent drowning.

• 船ふねから落おちた人ひとにブイを投なげた。

  They threw a lifebuoy to the person who fell from the boat.