: 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