柯林斯词典instep /ˈɪnˌstɛp/ (insteps) 1. N-COUNT Your instep is the middle part of your foot, where it arches upward. 脚背 返回 instep剑桥词典the curved upper part of the foot between the toes and the heel , or the part of a shoe or sock that fits around this 足背，足弓；鞋面；袜背 返回 instep