sway-backed adjective.
['sweɪbakt] L17.[Of Scandinavian origin: cf. Danish sveibaget, sveirygget, Swedish dial. svegryggad. Cf. SWAYED.]Having a sway-back;
fig. concave, having a concave part.
■ H. MacInnes The stone steps made sway-backed by centuries of..feet. [TahlilGaran] English Dictionary ▲