dig in your heels
dig in (one's) heels
To cling stubbornly to one's beliefs or wishes. Please let me tell my side of the story before you dig in your heels on this, OK? Well, I told Grace she can't go, and now she's dug in her heels as if this party is the most important thing in her life.
dig in your heelsor
dig your heels in
COMMON If you dig in your heels or dig your heels in, you refuse to do something such as change your opinions or plans. It was really the British who, by digging in their heels, prevented any last-minute deal. I begged her to come home but she dug her heels in.
dig in your heelsresist stubbornly; refuse to give in.
The image here is of a horse or other animal obstinately refusing to be led or ridden forwards. Dig in your heels is the commonest form, but dig in your toes and dig in your feet are also found.