a millstone around/round somebody's neck

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a millstone around/round somebody’s ˈneck

something which limits your freedom or makes you worry: My debts are a millstone round my neck.A millstone is a very large heavy flat stone used to crush grain to make flour. This phrase refers to an old form of punishing people by tying a heavy stone around their necks and dropping them into deep water to drown.
See also: around, millstone, neck, round