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| fall line (plural fall lines) |
noun |
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1. geography imaginary line along top of slope: an imaginary line along the edge of higher land, marked by rapids and waterfalls, that indicates where rivers begin to descend more steeply from a highland region to a lowland one
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2. skiing natural route of descent of hill: the natural route of descent on a hill between two given points
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3. climbing line connecting high and low point: vertical line connecting a high and low point on a mountain or cliff
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