be (like) a millstone around your neck idiom
(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。