Definition of millstone noun from the Oxford Advanced American Dictionary

 

millstone

 noun
noun
NAmE//ˈmɪlstoʊn//
 
 
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  • one of two flat round stones used, especially in the past, to crush grain to make flour
  • Idioms
    a millstone around your neck
     
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    a difficult problem or responsibility that it seems impossible to solve or get rid of My debts are a millstone around my neck. Unemployment was an economic millstone around the country's neck.
    See the Oxford Advanced Learner's Dictionary entry: millstone