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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. 2021

Example sentences from the Web for fall line

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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