Meaning of “be on your best behaviour” in the English Dictionary

british dictionary

"be on your best behaviour" in British English

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be on your best behaviour

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.

(Definition of “be on your best behaviour” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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