slogging

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

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

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