instep

noun

1. the arched upper surface of the human foot between the toes and the ankle.
2. the part of a shoe, stocking, etc., covering this surface.
3. the front of the hind leg of a horse, cow, etc., between the hock and the pastern joint; cannon.

noun

1. the middle section of the human foot, forming the arch between the ankle and toes
2. the part of a shoe, stocking, etc, covering this

n.

mid-15c., apparently from in + step, “though this hardly makes sense” [Weekley]. An Old English word for “instep” was fotwelm. Middle English also had a verb instep “to track, trace” (c.1400).

n.

1. The arched middle part of the foot between toes and ankle.