On your best behavior Meaning in English
expression
Definition
To behave in the most polite, respectful, or proper way you can, usually because you want to make a good impression or follow important rules.
Usage & Nuances
Often used by parents, teachers, or in formal situations to encourage children or guests to follow rules and act politely. Implies extra effort, not just ordinary manners. Can apply to adults too in job interviews, special events, or when meeting someone important.
Example Sentences
Please be on your best behavior at the dinner tonight.
basic
The teacher asked the students to be on their best behavior during the field trip.
basic
When you meet the principal, be on your best behavior.
basic
Grandma’s coming over, so try to be on your best behavior, okay?
natural
He was on his best behavior at the interview, hoping to get the job.
natural
The kids promised to be on their best behavior at the wedding, but they still managed to spill juice everywhere.
natural