Q. Would you please confirm that “over the top” is not hyphenated when used as a predicate adjective or adverbial phrase. Example: “It’s extreme,” she said. “Way over the top.”
A. We can confirm that Chicago style doesn’t require hyphens in over the top when it’s used as a predicate adjective (as in your example, where it modifies the implied subject “It” from the previous sentence) or when it’s used an adverb (“they went over the top with their demands”). But you won’t necessarily get this answer from the dictionary.
Merriam-Webster’s entry for that term shows two forms: the phrase over the top (without hyphens) and the adjective over-the-top (with hyphens). That hyphenated adjective, however, isn’t the last word.
In Merriam-Webster’s entries for over-the-top and many other hyphenated compound adjectives, the hyphens are generally presented as if they’re a permanent fixture of such terms. But more than a few of these terms—from clear-cut to well-versed—can be left unhyphenated when they follow rather than precede a noun that they modify, a usage long supported by CMOS. For example, you could refer to “an over-the-top solution” (with hyphens) but “a solution that was over the top” (no hyphens).
This nuance may be falling out of fashion (perhaps because it’s so easy to toggle over to the dictionary for any hyphenation question and copy whatever’s entered there), but it still matters in Chicago style. For more on this subject, see “Compound Modifiers After a Noun: A Postpositive Dilemma,” at CMOS Shop Talk. See also the hyphenation guide at CMOS 7.96, under “phrases, adjectival”; for adverbs, see “phrases, adverbial.”