boomerang
A flat curved airfoil that spins about an axis perpendicular to the direction of flight, originally used in various parts of the world as a hunting weapon or, in returnable types, for sports or training.
(idiomatic) To trounce; to defeat someone or something thoroughly, at a game or in battle. / (nautical) To rapidly destroy (a vessel) with overwhelming weapons fire.
Any onychopod of the family Podonidae
(physics) The diffusion of atoms or molecules among similar entities, especially in a solid
彼は風の強い丘で、手元に戻ってくるブーメランを投げる練習をした。
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