Related Clues:

• Walks heavily
• Wades (through)
• Walks laboriously
• Works up a sweat
• Toils
• Works over a hot stove, e.g.
• Difficult jobs
• Arduous journeys
• Breaks one's back, say
• Grinds
• Doesn't do the job easily
• Ancient galley crew
• Struggles (through)
• Moves through mud, e.g.
• Emancipation Proclamation subject