Dig your heels in

Origin

Picture a stubborn horse, determined not to move, planting its hooves firmly into the earth, resisting every pull from its handler. Or envision a child refusing to be led, dragging their feet and digging their heels into the ground to become an immovable object. This powerful image of physical resistance, where one literally plants their heels to anchor themselves and prevent movement, forms the core of the idiom. From these simple, undeniable acts of defiance, the phrase naturally extended to describe anyone who stubbornly refuses to change their mind or position, metaphorically planting their feet and refusing to budge.