Example: 
Teacher: '<em>Watch your tongue</em> young man, or I'll send you to the headmaster for using that language!.'
Photo license: 
CC: Attribution, Commercial Use
Regionalism: 
British
Regional variant: 
Mind your manners!
Regional variant: 
Neutral
Full Expression: 
Etiquette: Watch your tongue
French
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No
Spanish
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No
German
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No
Portuguese
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No

To remind use someone not to use rude language or swearing. Parents or teachers sometimes say it to children if they have said a bad word.

Chinese
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No
Italian
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No
Alsatian
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No