Cách sử dụng
The expression "between you, me and the gatepost" is used when you want to say something confidentially, meaning only between you and the person you're talking to, and not to be shared with anyone else. The phrase "gatepost" is used instead of "wall" or "tree" because traditionally, gateposts were used to nail public messages, hence being a means of communicating to others in public. So, if you want to talk about something secretly, you would use this expression to clarify that you want it kept a secret between the two of you.