behind closed doors
闭门造车
书面/口语·指秘密进行或私下处理
英文释义
in secret; privately; hidden from public view
例句
The deal was negotiated behind closed doors without public input.
典故来源
源自门作为隐私屏障的隐喻，'closed doors'象征秘密和隔绝，常用于描述私下决策。