slog

verbs

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