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   fall line

   noun

   • 1. the route leading straight down any particular part of a slope: "study the fall line and plan your turns"
   • 2. a narrow zone that marks the geological boundary between an upland region and a plain, distinguished by the occurrence of falls and rapids where rivers and streams cross it.
   • ▪ (in the US) the zone demarcating the Piedmont from the Atlantic coastal plain.

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