Related Clues:

• Half of a mountaineering trip
• Tough march
• Hill
• March through mud, e.g.
• Upward slope
• Wade knee-deep
• Balloonist's beginning
• Make slow progress
• Trudge (through)
• Tiresome task
• Chinese money
• Trudge through sludge, e.g.
• Trip up
• Exhausting hike
• Walk laboriously