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 sense 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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Merriam-Webster unabridged
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Time Traveler for swayback
The first known use of swayback was in 1821
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