"You'll be out of here within a few days, unless the doctors really dig in their heels."
It would have been very easy for them to dig in their heels and walk away.
I decided to take a chance and dug in my heels.
"But this is one of those issues where we are just going to have to dig in our heels."
But if this kept up he was going to dig in his heels.
"They dug in their heels and want to keep the system as it is."
I developed a thick skin and dug in my heels.
She tried to dig in her heels but could not slow herself.
Toby dug in his heels a couple of feet away.
He dug in his heels and brought himself up violently.
Idiome