Related Clues:

• Uses a coffee mill
• Road hazards
• Hard-to-break habits
• Conestoga-made grooves
• Metaphorical low points
• Extra study periods for students
• Reduces to a powder by friction
• Crushes to powder
• Extra lessons outside school
• Deep tracks in paths
• Deep tracks in path
• Grooves in the ground
• Sharpens by friction or studies hard
• Furrows not to get stuck in
• Gee, this gives ground with the peels!