overpronation

noun

over·​pro·​na·​tion -prō-ˈnā-shən 

: excessive pronation of the foot in walking or running that predisposes the individual to injuries on the medial side of the lower extremities and that causes heavier wear on shoes on the inner margin

overpronate

-ˈprō-ˌnāt 

intransitive verb

overpronated; overpronating

overpronator

-ˈprō-ˌnāt-ər 

noun