Definition of swayback
1
:an abnormally hollow condition or sagging of the back found especially in horses;
also
:a sagging back
2
:abnormally exaggerated forward curvature of the lumbar and cervical regions of the spine :lordosis 2
- Rarely is swayback a sign of anything serious. If you're in doubt, compare the posture of your child with that of other toddlers.
- —Parenting
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