Rappel/ræˈpel/ Definition 1 of 3Pro Tip 1/3Outdoor Activity Rappel is often used in the context of climbing or outdoor adventure. They prepared to rappel after reaching the mountain summit. Pro Tip 2/3Safety Gear Mention rappelling equipment to emphasize safety aspects in context. Before you rappel, double-check your harness and helmet. Pro Tip 3/3Action Precision Use 'rappel' to specifically describe descending with a rope, not just any descent. Unlike jumping or sliding down, you must rappel this steep cliff.