fall line ( synonym found)
Definition of fall line:

(n) : a line marking a boundary between an upland region and a plane; sometimes marked by a series of waterfalls on rivers that cross it; the imaginary line downhill that something falling downhill would naturally follow
Definition of fall line:

(n) : a line marking a boundary between an upland region and a plane; sometimes marked by a series of waterfalls on rivers that cross it; the imaginary line downhill that something falling downhill would naturally follow
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