The antonyms of "stays hidden" are numerous, as this phrase implies hiding or staying out of sight. Antonyms could include "becomes visible," "appears," "publicize," "reveals," "displays," "shows," and other similar phrases. Additionally, antonyms to "stays hidden" could include "exposes," "uncovers," "discloses," or "unveils," when referring to revealing information or secrets. Overall, the antonyms of "stays hidden" may vary depending on the context in which the phrase is used, but generally imply a shift from secrecy to openness or visibility.