slog

noun

A long, difficult period of hard, tiring work or movement.

"The journey was a real slog."

verb

To work or move with great effort and difficulty over a period.

"We had to slog through the mud."

Thesaurus

Synonyms: tramp, trudge, plod, pad, footslog, swig, slug, plug away, peg away, keep one's nose to the grindstone, keep one's shoulder to the wheel