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).
例文
1. The machine apply for leather handbags or instep folding turn edging.
本機は皮革、バッグ、靴の折り目、縁取りに適している。
2.Leather upper features straps over the instep for support.
皮革上の足甲機能を支持するゴムひも。
3.Does urine blister grow on infantile back of hand, instep ?
赤ちゃんの手の甲、足の甲に小さな水疱ができますか?
4.This machine can mold the joint point and instep point simultaneously.
1回の整形動作で関節点と足の甲点の定型を同時に完了することができます。
5.Attacks to the arms or legs,groin,joints,or instep .