"millstone" in the noun sense
1. albatross, millstone
figurative) something that hinders or handicaps
"she was an albatross around his neck"
2. millstone
any load that is difficult to carry
3. millstone
one of a pair of heavy flat disk-shaped stones that are rotated against one another to grind the grain
Source: WordNet® (An amazing lexical database of English)
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