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on one's best behavior
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as polite and well-mannered as one can be
What is the origin of the idiom "on one's best behavior" and when to use it?
The origin of the idiom "on one's best behavior" is not precisely documented, but it likely comes from the general idea of being well-mannered and polite in social situations. The word "behavior" refers to how one conducts themselves in social interactions. It is used to describe individuals who are making a conscious effort to exhibit good conduct and manners, usually to make a positive impression on others.
