1. to explore caves as a hobby or sport

Examples

• We decided to spelunk in the limestone caves of Kentucky.
• The geology club plans to spelunk every weekend this summer.
• She learned to spelunk safely with proper equipment and training.
• They spelunked through narrow passages deep underground.
• The experienced guide taught us how to spelunk responsibly.
• We need helmets and headlamps before we can spelunk in those caverns.