
A fall line (or fall zone) is the geomorphologic break between an upland region of relatively hard crystalline basement rock and a coastal plain of softer sedimentary rock. A fall line is typically prominent when crossed by a river, for there will often be rapids or waterfalls. Many times a fall line will recede upstream as the river cuts out the ...
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http://en.wikipedia.org/wiki/Fall_line
[skiing] Mathematically the fall line, the line of greatest slope, is the negative of the gradient (which points uphill) and perpendicular to the contour lines. Fall-Line Analysis: An evaluation of the mountain terrain in terms of the natural fall-line. The fall-line is the path an object takes as it moves down a slope perpendicular to the ...
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http://en.wikipedia.org/wiki/Fall_line_(skiing)

The direction a fall would take. The belay position and belay anchors should be in line with the fall line to prevent a pendulum effect. Avoid climbing in the fall line of another climber higher on the pitch. More in the climbing manual.
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http://santiamalpineclub.org/mountain/climbing/terms/

The direction a fall will take. The belay position and belay anchors must be in line with the fall line to prevent a pendulum effect. Avoid climbing in the fall line of another climber higher on the pitch, of a cornice or anything else that might come down the mountain. When traversing a glacier, stay lower on the glacier than the collection of ro...
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http://santiamalpineclub.org/mountain/climbing/terms/

The hypothetical path an object would take if allowed to roll freely down a given slope.
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http://snowheads.com/ski-forum/viewtopic.php?p=1814834

The path that takes you most directly downward on a slope.
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http://www.allstaractivities.com/sports/snowboarding/Snowboarding-terminolo

Direction water flows down a hill (path of least resistance). Constructing a trail on the fall line encourages water to run down the trail.
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http://www.americantrails.org/

line of numerous waterfalls, as at the edge of a plateau, where streams pass from resistant rocks to a plain of weak ones below. Such a line also ... [3 related articles]
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http://www.britannica.com/eb/a-z/f/5

Most direct line from the top of a slope downwards.
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http://www.encyclo.co.uk/local/20717

The straightest and steepest line down any slope. One you'll likely take if you fall.
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http://www.encyclo.co.uk/local/21224

An imaginary line describing the steepest route down a mountain. The fall line may change direction owing to bumps and dips.
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http://www.encyclo.co.uk/local/21283

A line connecting the waterfalls of nearly parallel rivers that marks a drop in land level.
Found on
http://www.nmfs.noaa.gov/pr/glossary.htm

The line of gravity or the most direct route down a slope.
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http://www.rei.com/learn/expert-advice/skiing-glossary.html

The most direct line down a trail or slope; known as such as if you fall, that
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http://www.skis.com/Glossary-of-Ski-Terms/article-12-18-2012,default,pg.htm

The line a ball would follow if rolled down the slope; the quickest route down the mountain.
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https://gb.ski.com/ski-glossary

The natural descent between two points on a slope: imagine the path a ball would take rolling down the mountain.
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https://snowslang.com/glossary/

The most direct route down the hill, often involuntarily taken by falling skiers
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https://www.encyclo.co.uk/local/21060

quickest route down the slope
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https://www.encyclo.co.uk/local/21304

Hypothetical line for the most direct route down a piste/trail.
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https://www.inghams.co.uk/ski-holidays/ski-holiday-types/ski-holidays-for-b

The most direct route down a ski slope.
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https://www.nbcolympics.com/news/alpine-skiing-101-glossary

An imaginary line that follows the steepest gradient down a slope. (i.e the path a rolling ball would follow down the slope).
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https://www.nbcolympics.com/news/freestyle-skiing-101-glossary

A designated line on the outrun of a ski jumping hill. If a ski jumper loses his balance and falls after the fall line, style points will not be deducted from his jump.
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https://www.nbcolympics.com/news/nordic-combined-101-glossary

The path of least resistance; the line of gravity down a slope.
Found on
https://www.rei.com/learn/expert-advice/snowboarding-glossary.html

the route directly down the hill.
Found on
https://www.snowplaza.co.uk/blog/4835-snowboarding-terms/

The most precise, direct line down a slope.
Found on
https://www.theskibum.com/snowboarding-glossary
No exact match found.