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fall line

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

An Americanism dating back to 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use fall line in a sentence

British Dictionary definitions for fall line (1 of 2)

fall line

noun
skiing the natural downward course between two points on a slope
the edge of a plateau

British Dictionary definitions for fall line (2 of 2)

Fall Line

noun
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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Scientific definitions for fall line

fall line
[ fôl ]

A line connecting the waterfalls of nearly parallel rivers that marks a drop in land level.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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