Related Clues:

• Slowly cause to deteriorate
• Crumble away gradually
• Slowly diminish
• Gradually wear down
• What canyon walls do over time
• Wear down over time
• Degrade what a Norseman did in speech?
• Some idle rodents lose ground?
• Disappear little by little
• Wear down bit by bit
• Gradually wear away, as soil
• Gradually get through drugs found on both sides of bar
• Seriously weaken
• Eat dirt?
• Start to crumble? Not entirely 'zero defects'