millstone

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millstone /ˈmɪlˌstoʊn/ noun
plural millstones
millstone
/ˈmɪlˌstoʊn/
noun
plural millstones
Learner's definition of MILLSTONE
[count]
: either one of two large, flat, round stones that are used for grinding grain in a mill
: a problem or responsibility that does not go away and that makes it difficult or impossible to do or achieve something