Watch your behavior and language.
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To watch your manners and behave well.
When you mind your P's and Q's, you pay close attention to how you come across and try not to offend.
It's often said as advice before a formal or important event.
"Watch Your Step"
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Being careful generally, not specifically about manners or etiquette
"On Your Best Behavior"
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Already behaving perfectly, not a reminder to start being careful
"Mind Your P's and Q's"
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Being deliberate and careful about manners, language, and social behavior