Related Clues:

• Difficult jobs
• Goes at a snail's pace
• Arduous journeys
• Grinds
• Routs
• Comes down hard
• Works like a dog
• Struggles (through)
• Moves through mud, e.g.
• Walks noisily
• Treks (through)
• Muddy marches
• Difficult journeys
• Some steamers
• Walks with effort