keep a civil tongue in your head

US /kiːp ə ˈsɪv.əl tʌŋ ɪn jʊər hɛd/
UK /kiːp ə ˈsɪv.əl tʌŋ ɪn jʊər hɛd/
"keep a civil tongue in your head" picture
1.

mantener un lenguaje civilizado, hablar con respeto

to speak politely and avoid rude or offensive language

:
You need to keep a civil tongue in your head when talking to your elders.
Debes mantener un lenguaje civilizado al hablar con tus mayores.
Even when angry, try to keep a civil tongue in your head.
Incluso cuando estés enojado, intenta mantener un lenguaje civilizado.