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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.
secret The financial details of the case have been kept firmly under wraps. The identity of the buyer is still 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]
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).