柯林斯詞典instep /??n?st?p/ (insteps) 1. N-COUNT Your instep is the middle part of your foot, where it arches upward. 腳背 返回 instep劍橋詞典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；襪背 返回 instep