Could you keep a secret?

Can you keep a secret?

A question asked before one discloses confidential information to confirm that the recipient will keep it confidential. A: "Can you keep a secret?" B: "Of course. What's going on?" A: "I'm getting the promotion!"
See also: can, keep
Farlex Dictionary of Idioms.

Could you keep a secret?

 and Can you keep a secret?
I am going to tell you something that I hope you will keep a secret. (Also used with can in place of could.) Tom: Could you keep a secret? Mary: Sure. Tom: Don't tell anybody, but I'm going to be a daddy. Sue: Can you keep a secret? Alice: Of course. Sue: We're moving to Atlanta.
See also: could, keep
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • Can you keep a secret?
  • keep (something) under wraps
  • keep by
  • keep (something) by
  • on the Q.T.
  • on the QT
  • keep (one's) seat
  • keep (one's) lips sealed
  • earn its keep
  • keep a secret