When a kayaker flips over or rolls over in their kayak, it is called a "capsizing" or "capsize." Capsizing can happen due to various reasons such as strong currents, rough waters, or a kayaker's lack of skill or experience. When a kayak capsizes, the kayaker can fall out of the boat and be submerged underwater, which can be dangerous if the kayaker is not wearing a properly fitted personal flotation device (PFD). Capsizing can also result in injuries, especially if the kayaker hits rocks or other obstacles in the water. Therefore, it is essential for kayakers to receive proper training and to always wear appropriate safety gear to minimize the risk of capsizing and ensure their safety while kayaking.