instep
US /ˈɪn.step/
UK /ˈɪn.step/

1.
collo del piede
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.
Ha calciato la palla con il collo del piede.
•
The shoe was too tight across the instep.
La scarpa era troppo stretta sul collo del piede.