Chimes in means to join in or interrupt a conversation, discussion, or argument. Some antonyms to this phrase could be staying silent, remaining quiet, refraining from speaking, or keeping mum. These words indicate that someone is not participating in the conversation or expressing their opinions. Other antonyms could include waiting for a good moment to speak, being respectful of others' opinions, or observing the conversation without adding anything to it. Using these words can help emphasize the importance of listening and understanding others without always feeling the need to share our own thoughts or ideas.