under wraps

Idioms  

1. Concealed or secret, as in The design for the new plant is under wraps. This idiom frequently is put as keep under wraps, meaning “keep secret,” as in Let's keep this theory under wraps until we've tested it sufficiently. It alludes to covering something completely by wrapping it up. [1930s]

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Example Sentences

They promised "viewers can expect explosive drama" but that "full details of Grant's comeback remain under wraps".

From BBC

Details of his Super Bowl set are under wraps, though Bad Bunny has pledged to showcase Puerto Rican culture in "a huge party."

From Barron's

Anglo American has kept details of the sale negotiations under wraps, with chief executive Duncan Wanblad saying on Thursday only that the separation is "progressing".

From Barron's

‘Today’ co-host Savannah Guthrie is on the mend after vocal surgery and has been keeping her ‘new voice’ under wraps — mostly.

From Los Angeles Times

“Today” co-host Savannah Guthrie is on the mend after vocal surgery and has been keeping her “new voice” under wraps — mostly.

From Los Angeles Times