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Related to gatepost: between you and me and the gatepost
between you and me
Also, between ourselves; just between you and me and the bedpost or four walls or gatepost or lamppost . In strict confidence. For example, Just between you and me, it was Janet who proposed to Bill rather than vice versa. This phrase, dating from about 1300, is generally followed by some informative statement that the listener is being asked to keep secret. The variant with bedpost, also shortened to post, dates from the early 1800s; four walls, also shortened to the wall, dates from the early 1900s, as does the gatepost.
See also: and
between you, me and the bedpostor
between you, me and the gatepost
If you say that something you say is between you, me and the bedpost or between you, me and the gatepost, you mean that the person you are talking to should not tell anyone else what you have said. Between you, me and the bedpost, I'd say he was completely confused. Between you, me and the gatepost, he'd be better off without her. Note: People also sometimes use fencepost instead of bedpost. That's my opinion, between you, me and the fencepost.