"Hush up" is an idiomatic expression that means to keep quiet or to silence someone or something. The antonyms for "hush up" are words that mean to speak up or to make noise. Some antonyms for "hush up" include speak out, vocalize, proclaim, announce, declare, broadcast, divulge, reveal, uncover, and expose. Using these words can often be seen in situations where individuals express their opinions or share their thoughts, usually in a public setting. These antonyms can also imply a sense of transparency, honesty, and openness, where there is no attempt to conceal or cover up anything.