In my novel-in-progress, two characters--an acrobat and his boss, the circus owner--argue interminably, getting exactly nowhere. I won't mention the topic of all that arguing; the point is the interminable arguing. A month or so ago, while working on these scenes and this relationship, the phrase locked horns came to mind. As it goes with the kind of writing I do, when an image seems fertile or resonant, I want to know more about, to see where it might lead me. So I googled locked horns, and learned quite a bit.
As some of you likely know, this phrase is a literal reference to horned animals and the kind of trouble they can get themselves into.
including this one, once locked together, the two may not be able to unlock. Thus they cannot eat or drink, and they cannot move without the other. They drag each other hither and yon until one or the other dies, and then the still-alive one is trapped by the dead one, barely able to move, and so the two become locked together in death--a gruesome situation.