slog

a. Sluggish. [ Obs. ] [ 1913 Webster ]

Somnolence that is sloggy slumbering Chaucer. [ 1913 Webster ]

v. t. & i. [ Cf. Slug, v. t. ] To hit hard, esp. with little attention to aim or the like, as in cricket or boxing; to slug. [ Cant or Slang ] [ Webster 1913 Suppl. ]

v. i. 1. to walk heavily; to plod; to walk through resisting terrain, as in mud. [ PJC ]

2. To work steadily and ploddingly; to toil. [ PJC ]