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Webster 1913 Edition

Noun.

An injury caused by violent strains or by overloading; – said of the backs of horses.

Crabb.

ppr.

Wielding; causing to lean; biasing; ruling.

Noun.

Swaying of the back, among beasts, is a kind of lumbago, caused by a fall or by being overloaded.

swaying

swaying ‎(plural swayings)

The motion of something that sways.
An injury caused to a horse's back by violent strains or overloading.
(Can we find and add a quotation of Crabb to this entry?)