: having an abnormally hollow or sagging back
On occasion, the cow shared the pasture with a swaybacked horse.—Wright Morris
: having or marked by abnormal forward curvature of the lumbar and cervical regions of the spine
… she stood upright, slightly swaybacked, affecting the bored look of a woman waiting for a bus.—Austin Murphy
: marked by a sagging appearance : having or being a part with a concave center
Behind the house was a collection of sheds and swaybacked barns …—Alec Wilkinson
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