PLOD

plod. Plod, v.i. to toil, drudge, labor, study closely

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Plod (?), v. i. [imp. & p. p. Plodded (?); p. pr. & vb. n. Plodding.] [[Gf. Gael. plod a clod, a pool; also, to strike or pelt with a clod or clods.]] 1. 1. To travel slowly but steadily; to trudge. Shak.
2. 2. To toil; to drudge; especially, to study laboriously and patiently. “Plodding schoolmen.” Drayton.