1 Often, plod along. trudge (along), tramp, slog, drag, tread, lumber, labour, Colloq stomp, galumph:
We plodded wearily up the road carrying our heavy packs.
2 Often, plod along or away. labour, work, drudge, toil, moil, slave (away), grind (away or along), grub (on or along), plug (along or away), Brit peg away (at) or along:
Plodding through the compilation of the Oxford Thesaurus, he was only halfway through the letter P.