Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- n. A line connecting the waterfalls of nearly parallel rivers that marks a drop in land level.
- n. The natural line of descent, as for skiing, between two points on a slope.
Wiktionary
- n. geomorphology A geomorphologic unconformity marking a boundary between an upland region and a plane; sometimes marked by a series of waterfalls on rivers that cross it.
- n. snowboarding The imaginary line downhill that something falling downhill would naturally follow.
Examples
“I arrived at the top of the lowest-angle fall line that started at thirty-eight degrees and eased off to about thirty-two degrees above a cluster of twenty fully grown pine trees.”
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