fall-line

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.

Origin:
1880–85, Americanism

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
fall line
 
n
1.  skiing the natural downward course between two points on a slope
2.  the edge of a plateau

Fall Line
 
n
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
fall line   (fôl)  Pronunciation Key 
A line connecting the waterfalls of nearly parallel rivers that marks a drop in land level.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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