I recently wrote the following sentence:
Please roll it back.
But if I were to describe the action on its own I would say:
This rollback was due to objections by the original author.
If I want to use "rollback" as a verb I have to split it up with an "it". My best guess is that "rollback" seems to be a compound noun birthed from a verb+adverb but we never got a verb compound form. Thus, the following is still incorrect:
Please rollback it.
Is there a term to describe the specific pair of "roll" and "back"? Describing this specific action will always need both words and the action itself now has an appropriate noun. But where did the combined verb form go?