a millstone around your neck

US /ə ˈmɪlˌstoʊn əˈraʊnd jʊər nɛk/
UK /ə ˈmɪlˌstoʊn əˈraʊnd jʊər nɛk/
"a millstone around your neck" picture
1.

a heavy burden of responsibility or worry

:
His gambling debts became a millstone around his neck.
The old factory was a millstone around the company's neck, costing them a fortune in repairs.