When it comes to antonyms for the phrase "makes official," there are several terms that can come to mind. Some of the most common include words like "invalidate," "annul," "nullify," "discharge," "revoke," "disclaimer," and "disavow." Each of these terms indicates a reversal or undoing of some kind of official declaration, whether it be a legal agreement, a decree, or a statement. While "makes official" implies an act of affirming, validating, or legitimizing something, antonyms for this phrase convey a distinct sense of negation, denial, or cancellation.