"Between you, me, and the gatepost" is a common phrase used to indicate secrecy or confidentiality. There are several synonyms for this phrase, including "off the record," "confidentially speaking," "privately," or "just between us." These phrases convey a sense of trust and confidentiality between the speaker and listener. They suggest that sensitive information has been shared, and it is important not to disclose it to anyone else. The use of such phrases is often necessary when discussing personal or sensitive topics, ensuring that the conversation remains private and confidential. So, the next time you need to discuss a sensitive topic or share confidential information, use these synonyms in place of "between you, me, and the gatepost" to express confidentiality and build trust between you and your listener.