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.

Определение и значение слова «on one's best behavior» на английском языке

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