What is hill to die on?

The phrase "hill to die on" refers to a strongly held belief or principle that someone is willing to defend, even if it means their downfall or defeat. It is often used in discussions about politics, religion, or other contentious issues where people have deeply ingrained beliefs. The phrase suggests that the person is so committed to their position that they would rather suffer severe consequences than compromise their principles. It is often used to describe a last stand or final battleground in a long series of conflicts.