'Instep' definitions:

Definition of 'instep'

(from WordNet)
noun
The arch of the foot
noun
The part of a shoe or stocking that covers the arch of the foot

Definition of 'Instep'

From: GCIDE
  • Instep \In"step\, n. [Formerly also instop, instup.] [1913 Webster]
  • 1. The arched middle portion of the human foot next in front of the ankle joint. [1913 Webster]
  • 2. The part of a shoe, boot, or stocking covering the instep[1]. [PJC]
  • 3. That part of the hind leg of the horse and allied animals, between the hock, or ham, and the pastern joint. [1913 Webster]