had been plodding
Past perfect progressiveconjugation ofplod.There are other translations for this conjugation.

plod

The lower story of the palace was worn, lacerated, and dusty, like feet which had been plodding for centuries.
La parte baja del palacio mostrábase roída, lacerada y polvorienta, como unos pies que hubiesen caminado durante siglos.
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