slog
      v 1: work doggedly or persistently; "She keeps plugging away at
           her dissertation" [syn: plug away, peg away, keep
           one's nose to the grindstone, keep one's shoulder to
           the wheel]
      2: walk heavily and firmly, as when weary, or through mud;
         "Mules plodded in a circle around a grindstone" [syn: footslog,
          plod, trudge, pad, tramp]
      3: strike heavily, especially with the fist or a bat; "He
         slugged me so hard that I passed out" [syn: slug, swig]
      [also: slogging, slogged]
 slogging
      See slog