Topic: MECHANICAL
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mill‧stone
[countable]
[countable]1TEM one of the two large circular stones that crush grain into flour in a mill
2 something that causes a lot of problems for someone, and that they cannot get rid of :
Inflation is still a millstone round the neck of British businesses.
a millstone round/around somebody's neck
Inflation is still a millstone round the neck of British businesses.