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. 回力镖,飞去来器(澳大利亚土著人最先用于狩猎) - (figurative)
The plan had a boomerang effect (= caused unexpected harm to the person responsible for it). 该计划产生了反效果。
Word Originearly 19th cent.: from Dharuk.- (figurative)