under wraps

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]

Example Sentences

She’s bearing witness to a human dilemma our culture would prefer to keep under wraps, but Ortega might just as easily be doing an audio essay or podcast.

From Los Angeles Times

He’s developing documentary and narrative feature projects, though he’s keeping the details under wraps.

From Los Angeles Times

It seems like everything is kept pretty under wraps for these massive superhero movies.

From Los Angeles Times

He added: "It would have had to be kept under wraps due to security otherwise thousands of people would have turned up."

From BBC

The Nerves: “We’d kept Paul’s return under wraps purposefully, and Paul was the cheerleader of that,” says executive producer John Hoffman, who admits concern over the surprise.

From Los Angeles Times