The phrase "in holes and corners" refers to something that is hidden, concealed, or secret. Antonyms for this phrase would include terms like open, visible, or public. The opposite of hiding in corners would be to be out in the open, while the opposite of being in a hole would be to be high up or elevated. Other antonyms for "in holes and corners" could include words like exposed, unguarded, or transparent. All of these words indicate that something is not only visible or apparent, but also readily accessible to others. Overall, these antonyms represent a sense of openness and transparency, rather than secrecy and concealment.