instep
US /ˈɪn.step/
UK /ˈɪn.step/

1.
cou-de-pied
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.
Il a frappé le ballon avec le cou-de-pied.
•
The shoe was too tight across the instep.
La chaussure était trop serrée au niveau du cou-de-pied.