noun

millstone

MILL-stohn/ˈmɪlstəʊn/

A heavy burden or problem that slows someone down.

The traveler's burden has become a millstone, slowing every step.

A weary traveler tries to move forward while dragging an enormous round stone on a small sledge tied to the waist by a broad belt, visibly slowed by an excessive burden.
Etymology

A heavy grinding stone became a figurative weight that slows someone down.

More examples

  • The failing project becomes a millstone.
  • Old obligations remain a millstone around her neck.

Forms

millstone

Similar words

burden
A broader responsibility or weight.
encumbrance
Something that restricts movement or progress.