millstone
noun [ C ] uk/ˈmɪl.stəʊn/ us/ˈmɪl.stoʊn/
磨石，磨盘
one of a pair of large, circular, flat stones used, especially in the past, to crush grain to make flour
Idiom
be (like) a millstone around your neckidiom (UK also be (like) a millstone round your neck)犹如套在（某人）脖子上的磨盘，成了（某人的）沉重负担
to be a responsibility that is difficult to bear and causes you trouble
The mortgage on his house had become a millstone around his neck. 房屋抵押贷款让他不堪重负。