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The Collaborative International Dictionary
instup

Instep \In"step\, n. [Formerly also instop, instup.]

  1. The arched middle portion of the human foot next in front of the ankle joint.

  2. The part of a shoe, boot, or stocking covering the instep[1].

  3. That part of the hind leg of the horse and allied animals, between the hock, or ham, and the pastern joint.