be on your best behaviour Definition in British English Dictionary
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Definition of "be on your best behaviour" - British English Dictionary

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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.
Translations of “be on your best behaviour”
in Chinese (Traditional) 舉止得體, 以最好的表現示人…
in Chinese (Simplified) 举止得体, 以最好的表现示人…
(Definition of be on your best behaviour from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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