We don't have synonyms for fall lines yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are fall line, cell lines and fault lines.
(n) :
(snowboarding, skiing) The imaginary line downhill that something falling downhill would naturally follow.
(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, skiing) The imaginary line downhill that something falling downhill would naturally follow.
(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.