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on one's best behavior
01
as polite and well-mannered as one can be
Idiom
InformalWhat 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.
Example
The 1,400 fans were on their best behavior and filed out peacefully at the end.
At the company's annual gala, all employees are expected to be on their best behavior and represent the organization professionally.
When meeting her partner's parents for the first time, she was on her best behavior, trying to make a favorable impression.
