
Be on your best behaviour
Special Occasions
Used during events where polite behavior is expected, like weddings or formal dinners.

She knew to be on her best behaviour during the awards ceremony.
Expectation
Suggests that there's an expectation to act better than usual.

The children were reminded to be on their best behaviour when the guests arrived.
Impression Matters
Important when first impressions count, like meeting someone's family.

He was on his best behaviour when he met her parents for the first time.
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