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In secret; privately or confidentially: held the meeting sub rosa.
[Latin sub rosā, under the rose (from the practice of hanging a rose over a meeting as a symbol of confidentiality) : sub, under + rosā, ablative of rosa, rose.]
sub-ro′sa (səb-rō′zə) adj.
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|Adj.||1.||sub-rosa - designed and carried out secretly or confidentially; "a sub-rosa report"; "has their under-the-table backing"|
covert - secret or hidden; not openly practiced or engaged in or shown or avowed; "covert actions by the CIA"; "covert funding for the rebels"