Related Clues:

• Worm's unit?
• Not tread lightly
• Don't tread lightly
• Trudge (on)
• Take tiny steps
• Division on a 5-Down
• Slog (along)
• Walk like a lummox
• Walk with heavy steps
• Stubborn people won't give one
• Worm size
• 1/12 of a foot
• Unit indicated by '
• Move very slowly
• Advance at a snail's pace