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

Although the meaning of the red cloak and details of who might be wearing it are under wraps for now, Winkleman told journalists earlier this month that the next series "gets pretty twisty".

From BBC

It became a huge hit all over Europe, with Bardot's version remaining under wraps for 20 years.

From BBC

The agreement was kept under wraps because Jump wanted to avoid any regulatory scrutiny, the lawsuit said.

From The Wall Street Journal

“I think there were just some things he kept under wraps about his body,” Roberts said of the 31-year-old left-hander, who missed a month in the second half of the season with forearm inflammation.

From Los Angeles Times

Details of the Budget are supposed to be kept under wraps until the chancellor announces them in the House of Commons.

From BBC