"trudge, travel or work slowly and perseveringly; go with steady and laborious diligence," 1560s, of uncertain origin, perhaps imitative of the sound of walking heavily or slowly. Related: Plodded; plodder; plodding.
Mules plodded in a circle around a grindstone
I could recognize his plod anywhere
plink
plinth
plio-
Pliocene
PLO
plod
plodding
plonk
plop
plosive
plot