Definition of under the rose in English:

under the rose

phrase

archaic
  • In confidence; under pledge of secrecy.

    ‘Attendees understood that whatever was said under the rose - or sub rosa - had to remain a secret.’
    See also sub rosa
    • ‘In ancient times a rose was attached to the ceiling of council chambers as an indication that everybody present was sworn to secrecy, sub rosa - under the rose.’
    in secret, secretly, in private, privately, in confidence, confidentially, behind closed doors, surreptitiously, discreetly, furtively, clandestinely, on the quiet, on the sly, unofficially, off the record, between ourselves