Avalanche/ˈævəlæntʃ/ Definition 1 of 5Pro Tip 1/3Natural Disaster Refers to a sudden, catastrophic event involving nature. The documentary highlighted the devastating effects of an avalanche on small villages. Pro Tip 2/3Unpredictable Danger Stresses the sudden and often unexpected nature of this event. Hikers fear the risk of an avalanche most in spring. Pro Tip 3/3Rapid Descent Emphasizes the speed and force of the falling mass. The sheer velocity of the avalanche made escape impossible.