The antonyms for the phrase "brought out into open" can vary depending on the context in which it is used. However, some possible antonyms that come to mind include "kept hidden," "concealed," "covered up," "suppressed," "repressed," "buried," "denied," or "obscured." These words all suggest that something is being kept from public view or knowledge, either intentionally or inadvertently. One example of a situation where these antonyms might be appropriate is when discussing a scandal or a controversial issue that people are trying to keep under wraps. In such cases, it is important to shine a light on the truth and expose what has been hidden.