Related Clues:

• Skateboarder's surface
• Water-skier's accessory
• Evel Knievel prop
• Airplane access
• Interstate entrance or exit
• Inclined surface
• See 109 Across
• Way up or way down
• Skatepark feature
• Skateboarding setting
• A way off and on
• Intensify, with "up"
• Water skier's apparatus
• Evel aid
• Increase, with "up"