The phrase "my lips are sealed" is commonly used to show that someone won't disclose a secret or information. However, there are numerous synonyms that we can use to express this concept. Some of these include "keeping mum," "zipping my mouth," "sworn to secrecy," "not a peep," "buttoning my lips," "silence is golden," "not breathing a word," and "tight-lipped." Using these synonyms can add variety and interest to our language while also indicating our unwillingness to reveal confidential information. So next time, instead of saying "my lips are sealed," try using some of these alternative phrases to keep your conversations more lively.