dug in one's heels

To dig in one’s heels means to stubbornly refuse to change one’s position or opinion, often in the face of pressure or opposition.

The phrase evokes the image of physically planting one’s feet firmly to resist being moved.

Historically, it has been associated with military tactics, where soldiers would brace themselves to hold their ground.

Figuratively, it suggests obstinacy or defiance, sometimes to the point of irrationality: She dug in her heels and refused to apologize, even though she was clearly in the wrong.