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).
实用例句
1. The machine apply for leather handbags or instep folding turn edging.
该机适合皮革、皮包、鞋面折边、翻边.
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2. Leather upper features straps over the instep for support.
在皮革上的支持脚背功能松紧带.
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3. Does urine blister grow on infantile back of hand, instep?
婴儿手背 、 脚背上长小水疱?
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4. This machine can mold the joint point and instep point simultaneously.
一次整型动作即可同时完成关节点与脚背点之定型.
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5. Attacks to the arms or legs, groin, joints, or instep.