1. Work doggedly or persistently (synset 202420703)
    "She keeps plugging away at her dissertation"
  2. Walk heavily and firmly, as when weary, or through mud (synset 201925197)
    "Mules plodded in a circle around a grindstone"
  3. Strike heavily, especially with the fist or a bat (synset 201418239)
    "He slugged me so hard that I passed out"

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