slog

(verb) work doggedly or persistently. Synonyms: plug away, peg away, keep one's nose to the grindstone, keep one's shoulder to the wheel. Examples: "She keeps plugging away at her dissertation."

(verb) walk heavily and firmly, as when weary, or through mud. Synonyms: footslog, plod, trudge, pad, tramp. Examples: "Mules plodded in a circle around a grindstone."

(verb) strike heavily, especially with the fist or a bat. Synonyms: slug, swig. Examples: "He slugged me so hard that i passed out."