When it comes to keeping secrets, "keep between us" is a common phrase that is often used. However, sometimes we need to find different ways to say the same thing. Some synonyms for "keep between us" include "keep it confidential," "keep it hush-hush," "keep it on the down-low," "keep it a secret," and "keep it between us girls/boys." These phrases all convey the same idea of keeping something private and not sharing it with others. It's important to keep in mind that confidentiality and trust are essential values in any relationship, and knowing these synonyms can come in handy when you need to discuss sensitive information.