keep a civil tongue
保持禮貌和謙和的口舌
正式或口語·提醒保持禮貌言辭
英文釋義
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.
典故來源
源自禮貌交談的禮儀,civil意為文明的,強調用詞得體不冒犯。