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). 该计划产生了飞旋镖效应。
Word Originearly 19th cent.: from Dharuk.- (figurative)
