The phrase "going over big" refers to something that is successful or popular. Antonyms for this phrase include "failing," "unpopular," "rejected," and "unsuccessful." These words describe situations when a particular thing or idea didn't meet the expectations of the audience or failed to resonate with them. "Going over big" can be used to describe a variety of things, such as a performance, a product launch, or even a party. In contrast, the antonyms convey a sense of disappointment, failure, and rejection. When preparing for an event or project, it's important to consider these antonyms to avoid any pitfalls and ensure that your ideas are well-received.