“Behind closed doors” in Japanese
Short answer
Behind closed doors in Japanese is “秘密裡” (himitsuri). Full meaning: behind closed doors, behind-the-scenes, (under the veil of) secrecy.
Other ways to say “Behind closed doors” in Japanese
無観客
mukankyaku without an audience, crowdless, behind closed doors
水面下
suimenka underwater; behind closed doors, behind the scenes, below the surface
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