Verb
-
strike heavily, especially with the fist or a bat
"He slugged me so hard that I passed out"
-
walk heavily and firmly, as when weary, or through mud
"Mules plodded in a circle around a grindstone"
-
work doggedly or persistently
"She keeps plugging away at her dissertation"
- plug away - peg away - keep one's nose to the grindstone - keep one's shoulder to the wheel