slog
verb.
work doggedly or persistently
She keeps plugging away at her dissertation
Synonym: keep one's nose to the grindstone, keep one's shoulder to the wheel, peg away, plug away
verb.
walk heavily and firmly, as when weary, or through mud
Mules plodded in a circle around a grindstone
Synonym: trudge, tramp, plod, pad, footslog
verb.
strike heavily, especially with the fist or a bat
He slugged me so hard that I passed out
Synonym: slug, swig