die on this hill

1. To pursue some issue or course of action with total and wholehearted conviction, despite the difficulty and potential consequences of doing so. It's clear that the governor's willing to die on this hill. I guess we'll see how voters feel about her tax hike during the next election. Look, having principles in business is important, but not if they're going to destroy your company. Don't die on this hill! A: "I don't want the people on the board to think I'm wishy-washy." B: "OK, but this particular issue is so trivial. Maybe don't die on this hill."

2. To defend or maintain some position or argument with total conviction, without concern as to whether or not one will be considered correct or change anyone else's opinion. Often used facetiously. I know I'm in the minority, but I'll die on this hill—the third film is the best in the entire series! You got into a fight with him over the correct way to organize utensils in the kitchen? You're really going to die on this hill? A: "Are you really defending the Oxford comma this passionately?" B: "Hello, I have two English degrees—I am definitely prepared to die on this hill!"