Related Clues:

• Like dried mud on shoes
• Crusted, as with mud
• Like dry, clumpy mud
• Like hardened mud on boots
• First couple of keys in low type stuck together
• Like a layer of mud on boots
• Thickly stuck (on)
• Like dry mud on a dog's paws
• Died, removing arrow - periodically being covered in mud, for example
• Like hardened mud on tires