keep a civil tongue
保持礼貌和谦和的口舌
正式或口语·提醒保持礼貌言辞
英文释义
to speak in a polite and respectful manner; to refrain from using offensive or rude language
例句
Even when you're angry, keep a civil tongue in your head.
典故来源
源自礼貌交谈的礼仪，civil意为文明的，强调用词得体不冒犯。