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Secret. Keep this under wraps for now, but Greg is definitely the one getting the promotion.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
Fig. concealed; suppressed. (*Typically: be ~; have ~; hold ~; keep ~.) We kept the candidate's conviction under wraps until after the election. The plan we had under wraps had to be scrapped anyway.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
mod. (held) in secret. We kept it under wraps until after the election.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.
Secret or concealed: "The news was kept under wraps for the three-day weekend" (Boston Globe).
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.