fall line








noun

  1. an imaginary line, marked by waterfalls and rapids, where rivers descend abruptly from an upland to a lowland.
  2. (initial capital letters) Eastern U.S. the imaginary line between the Piedmont and the Atlantic coastal plain.
  3. Skiing. the path of natural descent from one point on a slope to another.

noun

  1. skiing the natural downward course between two points on a slope
  2. the edge of a plateau

noun

  1. a natural junction, running parallel to the E coast of the US, between the hard rocks of the Appalachians and the softer coastal plain, along which rivers form falls and rapids

  1. A line connecting the waterfalls of nearly parallel rivers that marks a drop in land level.

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