to behave extremely well and be very polite on a particular occasion: I'd just met his parents for the first time so I was on my best behaviour. Want to learn more?
What does it mean to be on your best behavior?
Definition of on one's best behavior
: behaving very politely and well The children promised to be on their best behavior.
How do you say your best behavior?
synonyms for be on best behavior
- manage.
- control.
- direct.
- act correctly.
- act one's age.
- act with decorum.
- be civil.
- be good.
