2 Metaphors for clashes

This clash of instincts, the struggle between different foci of the vegetative system competing for the possession of the brain, is a common everyday process in conduct.

But the clash is a more recent invention: Lowth, Ash, and Ward,Buchanan, Bicknell, and Burn,though they name all the rest, make no mention of this mark; but it appears by their books, that they all occasionally used it.

2 Metaphors for  clashes