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Secret. Keep this under wraps for now, but Greg is definitely the one getting the promotion.
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.
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]
mod. (held) in secret. We kept it under wraps until after the election.
Secret or concealed: "The news was kept under wraps for the three-day weekend" (Boston Globe).