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.

falling weatherfalloff
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