Dictionary![]() ![]() fall' line"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. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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