demolition ball
noun [ C ] UK uk/dem.əˈlɪʃ.ən ˌbɔːl/ us/dem.əˈlɪʃ.ən ˌbɑːl/ (also mainly US wrecking ball)
（拆除建筑物所使用的）落锤破碎机
a large, heavy metal ball that is swung against a building in order to knock it down because it is no longer needed