Body forth has a rather unique meaning in the English language, namely "to give visible form or shape to something." Therefore, antonyms of the phrase would necessarily imply the opposite. Some possibilities could include: erase, obscure, minimize, shrink, dissipate, dissolve, or diminish. These words all suggest some kind of reduction or negation of the idea of giving shape to something or making it appear visibly. It's important to note, however, that antonyms for a phrase like "body forth" may vary depending on the specific context and intended meaning.