The grammar of “regime change”…

When we speak of politics using a war metaphor, what is it that the various factions fight with or about? One may certainly offer “policy” or “office” as correct answers. But, going a little deeper, I believe the fundamental fight is over definitions. What the term “regime change” means, for example, affects policy and, therefore, affects lives. Josh Marshall detects a semantic shift in “regime change” based on a question of grammar: Is “regime” an object or a subject. The answer affects policy; it is more than merely linguistic entertainment.