pronation
noun [ U ] medical specialized uk/prəʊˈneɪ.ʃən/ us/proʊˈneɪ.ʃən/
将手掌／脚掌转朝下，旋前
rotation of the palm of the hand or sole of the foot so the inner part faces down
Excessive pronation can cause lower leg pain. 过度地将脚掌转朝下会引起小腿疼痛。