instep
US /ˈɪn.step/
UK /ˈɪn.step/

1.
empeine
the part of a person's foot between the toes and the ankle, where the arch is highest
:
•
He kicked the ball with the instep of his foot.
Pateó el balón con el empeine de su pie.
•
The shoe was too tight across the instep.
El zapato estaba demasiado apretado en el empeine.