Meaning of the word "be on your best behaviour" in English

What does "be on your best behaviour" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

be on your best behaviour

US /bi ɑn yʊər bɛst bɪˈheɪvjər/
UK /bi ɑn yʊər bɛst bɪˈheɪvjər/
"be on your best behaviour" picture

Idiom

1.

to act in the most polite and proper way possible, especially in a situation where you want to make a good impression

Example:
When you meet my parents, I expect you to be on your best behaviour.
The children were told to be on their best behaviour during the school trip.
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