keep something, stay, etc. under wraps
keep (something) under wraps
To keep something secret. Keep this under wraps for now, but Greg is definitely the one getting the promotion.
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.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
Farlex Partner Idioms Dictionary © Farlex 2017