either of a pair of circular stones between which grain or another substance is ground, as in a mill.
anything that grinds or crushes.
any heavy mental or emotional burden (often used in the phrase a millstone around one's neck ).

before 1050; Middle English milneston, Old English mylenstān. See mill1, stone Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
millstone (ˈmɪlˌstəʊn)
1.  one of a pair of heavy flat disc-shaped stones that are rotated one against the other to grind grain
2.  a heavy burden, such as a responsibility or obligation: his debts were a millstone round his neck

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

O.E. mylenstan, from mill (n.1) + stone (q.v.). Fig. sense of "a burden" is from Matt. xviii.6.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Fewer people are turfed out of their homes, but the millstone of debt weighs for longer.
But once those ships began taking on water, gold was a millstone around their necks.
It's too soon to tell how heavy that millstone will be.
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