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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.
A landslide is the movement of rock, earth, or debris down a sloped section of land. Landslides are caused by rain, earthquakes, volcanoes, or other factors that make the slope unstable. Geologists, scientists who study the physical formations of the Earth, sometimes describe landslides as one type of mass wasting. A mass wasting is any downward movement in which the Earth's surface is worn away.