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landslide. 1  the sliding of a mass of loosened rocks or earth down a hillside or slope. 2  the mass of loosened material sliding down. 3  an overwhelming majority of votes for one candidate or party in an election. 4  any overwhelming victory.
Landslides occur when masses of rock, earth, or debris move down a slope. Debris flows, also known as mudslides, are a common type of fast-moving landslide that tends to flow in channels. Mudslides develop when water rapidly accumulates in the ground and results in a surge of water-saturated rock, earth, and debris. Mudslides usually start on steep slopes and can be activated by natural disasters. Areas where wildfires or human modification of the land have destroyed vegetation on slopes are particularly vulnerable to landslides during and after heavy rains.