Hill To Die On Meaning

(idiomatic) An issue to pursue with wholehearted conviction and/or single-minded focus.

Example: 2006, Cate Dermody, The Firebird Deception, Silhouette Books (2006), ISBN 9781426854514, page 113:
  "I'm sorry, Alisha. I can't overrule the European director's decision to move you out of her arena. This isn't a hill to die on. […]
2009, Kevin Leman, Under the Sheets: The Secrets to Hot Sex in Your Marriage, Revell (2009), ISBN 9780800734022, page 179:
  Is correct laundry folding really a hill to die on?
2010, Deborah Smith Pegues & Ricky Temple, Why Smart People Make Dumb Choices, Harvest House Publishers (2010), ISBN 9780736928526, page 49:
  Though I simply apologized and told him his ranting wasn't necessary. He made a bad decision. I made a good one. As livid as I was, I realized this situation was not a hill to die on.
For more examples of usage of this term, see Citations:hill to die on.