keep a civil tongue

keep a civil tongue

To speak kindly and politely; to refrain from using harsh, insolent, or rude language. I don't want any outbursts between you and your sister during this dinner, so please keep a civil tongue, understood? I know that this is a heated topic, but I would ask that all participants in the debate please keep a civil tongue.
See also: civil, keep, tongue
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

keep a civil tongue (in one's head)

Fig. to speak decently and politely. Please, John. Don't talk like that. Keep a civil tongue in your head. John seems unable to keep a civil tongue.
See also: civil, keep, tongue
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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At the same time, he should have told the woman to keep a civil tongue in her head.
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