When it comes to staying out of other people's business, there are many synonyms for "not meddle" that can be used. One possible option is "mind your own business," which encourages people to focus on their own concerns rather than interfering with others. Another alternative is "keep your nose out of it," which suggests that people should avoid getting involved in situations where they are not needed. Some other synonyms for "not meddle" include "stay out of the way," "leave well enough alone," and "let it be." Whatever phrase you choose, the key is to respect others' boundaries and avoid unnecessary interference.