under wraps

under wraps

Secret. Keep this under wraps for now, but Greg is definitely the one getting the promotion.
See also: wrap
Farlex Dictionary of Idioms.

*under wraps

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.
See also: wrap
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

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, 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]
See also: wrap
The American Heritage® Dictionary of Idioms by Christine Ammer.

under wraps

mod. (held) in secret. We kept it under wraps until after the election.
See also: wrap
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions

under wraps

Informal
Secret or concealed: "The news was kept under wraps for the three-day weekend" (Boston Globe).
See also: wrap
American Heritage® Dictionary of the English Language, Fifth Edition.
See also:
  • on one's
  • on someone's
  • (Have you) been OK?
  • pillow-biter
  • #dead
  • out of one's
  • (I've) got to go
  • save someone's skin
  • it's dogged that does it
  • (something) blows