keep something, stay, etc. under wraps

stay under wraps

To remain secret; to not be disclosed to anyone. I think it's best that this stays under wraps until we can determine what impact it will have on the public.
See also: stay, wrap
Farlex Dictionary of Idioms.

keep something, stay, etc. under ˈwraps

(informal) keep something, stay, etc. secret or hidden: These letters have lain under wraps since the 1960s. Next year’s event is still being kept under wraps.
See also: keep, wrap
Farlex Partner Idioms Dictionary
See also:
  • stay under wraps
  • take the wraps off
  • take the wraps off something
  • under wraps
  • under (one's) hat
  • under hat
  • keep (something) under wraps
  • keep something under wraps
  • keep under wraps
  • what happens at home stays at home