keep under wraps

Concealed or secret, as in The design for the new plant is under wraps. This idiom frequently is put as keep under wraps, meaningkeep secret,” as in Let’s keep this theory under wraps until we’ve tested it sufficiently.

Torvalds added that with the “security issues kept under wraps, we couldn’t do our usual open methods. This made fixing the bugs much more painful than it should be.”

 

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