be on your best behaviour
成語所屬單字behaviour
be on your best behaviour — 慣用語
1. To act in the most polite and correct way possible.
1.慣用語
釋義
表現出最好的行為
To act in the most polite and correct way possible.
例句
Maya was on her best behaviour during the job interview.
Are you on your best behaviour when visiting your grandparents?