回力镖,飞去来器(澳大利亚土著人最先用于狩猎)a curved flat piece of wood that you throw and that can fly in a circle and come back to you. Boomerangs were first used by Australian Aborigines as weapons when they were hunting.
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(计划等)令人反受其害if a planboomerangs on sb, it hurts them instead of the person it was intended to hurt