behind closed doors (baihāindo kurōzudo dōzu)

Idiom Secrets

意味

in private; secretly

プライベートで; 秘密で (puraibēto de; himitsu de)

例文

"The deal was made behind closed doors."

"取引は秘密裏に行われました。" (Torihiki wa himitsuri ni okonawaremashita.)