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What is going to be or has been said should not be told to anyone else; between us. This phrase is usually said along with information that needs to be kept secret. I overheard the boss talking to her secretary last night and, just between ourselves, she's giving the promotion to George after all. Between ourselves, Stephanie is not as qualified for this job as she claims to be.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
between you and ˈmeas a secret or private matter that nobody else should know about: Just between you and me, I’ve heard that the business made a big loss last year.
Farlex Partner Idioms Dictionary © Farlex 2017