a millstone around your neck
a millstone around (one's) neck
An extremely difficult or disadvantageous burden or hindrance. I wish I hadn't bought that house—the mortgage is a millstone around my neck. Given the advisor's laundry list of scandals, he's proving to be quite a millstone around the candidate's neck.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
a millstone around your neckBRITISH, AMERICAN or
a millstone round your neckBRITISH
COMMON If something is a millstone around your neck or a millstone round your neck, it is a very unpleasant problem or responsibility that you cannot escape from. The country's inefficient telephone company has been a millstone round the government's neck. Long-term illness can make you feel like a millstone around your family's necks. Note: Millstone is often used on its own with this meaning. There is the continuing millstone of the country's enormous foreign debt. Note: A millstone is one of a pair of very heavy round flat stones which are used to grind grain. Jesus referred to children in Matthew 18:5 by saying, `Whoso shall offend one of these little ones which believe in me, it were better for him that a millstone were hanged about his neck and that he were drowned in the depth of the sea.'
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012