fall line

noun

1. : a line joining the waterfalls on a number of rivers that marks the point where each river descends from the upland to the lowland and the limit of its navigability

2. : the natural downward course (as for skiing) between two points on a slope

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1. an imaginary line, marked by waterfalls and rapids, where rivers descend abruptly from an upland to a lowland.

2. (caps.) 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.

[1880-85, Amer.]

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fall line noun

1. The edge of a plateau

2. (in skiing) the natural line of descent on a slope

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Main Entry: ↑fall

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fall line,

1. a line which marks the end of layers of hard rock of a plateau and the beginning of a softer rock layer of the coastal plain. There are many waterfalls and rapids along this line.

2. a natural downhill course in skiing; the straight line from the skier to the bottom of a slope.

Fall Line,

a fall line running north and south to the east of the Appalachian Mountains. Philadelphia, Baltimore, and Richmond were built along the Fall Line to take advantage of the available water power.

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n.

1) a narrow zone that marks the geological boundary between an upland region and a plain, distinguished by the occurrence of falls and rapids where rivers and streams cross it

■ (the Fall Line) (in the U.S.) the zone demarcating the Piedmont from the Atlantic coastal plain

2) the fall line Skiing the route leading straight down any particular part of a slope