be on your best behaviour
US /bi ɑn yʊər bɛst bɪˈheɪvjər/
UK /bi ɑn yʊər bɛst bɪˈheɪvjər/
1.
表現得最好, 規規矩矩
to act in the most polite and proper way possible, especially in a situation where you want to make a good impression
:
•
When you meet my parents, I expect you to be on your best behaviour.
當你見到我父母時，我希望你表現得最好。
•
The children were told to be on their best behaviour during the school trip.
孩子們被告知在學校旅行期間要表現得最好。