Definition of "falling"

Of these, nine were on the Forfar-Perth section, eight were over the sharply-falling grades from Gleneagles to Perth, [...].

1941 March, “Notes and News: Fastest Runs in Scotland, 1940 and 1941”, in Railway Magazine, page 130

Epilepsies, or fallings and reelings, and beastly vomitings. The least of these, even when the tongue begins to be untied, is a degree of drunkenness.

1651, Jer[emy] Taylor, The Rule and Exercises of Holy Living. […], 2nd edition, London: […] Francis Ashe […]