hill I am willing to die on

An opinion with which one will stick no matter what, yea verily, even unto death itself. Usually regarding an incredibly trivial and inconsequential matter... but not always.

"coconut water is a top tier beverage. this is a hill i am willing to die on" - Twitter user @nailaham1ra, 8/19/2020

I say Bernie got screwed, and that's a hill I am wiling to die on.