out of line
行為失禮或不合適，違反了某種規定或準則。
口語·批評不當行為
英文釋義
behaving inappropriately or not following the expected standards or rules
例句
His joke was totally out of line at the meeting.
典故來源
源自軍隊隊列紀律，士兵偏離隊列即違反規定，引申為行為失當。