Related Clues:

• Topples
• Plummets
• Stalactite sites
• River feature
• Surrenders
• Doesn't stay up
• Spelunking sites
• Yields to pressure
• Yosemite attraction
• Gives in
• Bequeaths
• Places to spelunk
• 'What ___?!'
• Is generous at the office?
• Canoeists' fears