Learn useful ways to say "we'll be on our best behaviour" in English with drama examples and natural alternatives.

This means the speaker promises to act properly and not cause trouble.
From The Dumb Billionaire Heiress In Love Part I, Episode 9
Someone says they will behave well in front of others.
Use this before meeting someone important or in a formal setting. It is common in British English spelling as behaviour, but the meaning is straightforward.
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