(just) between you and me

(just) between you and me

What is going to be or has been said should not be told to anyone else. 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 you and me, she's giving the promotion to George after all. Between you and me, Stephanie is not as qualified for this job as she claims to be.
See also: and