be on your best behaviour Definition in the Cambridge English Dictionary
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Definition of “be on your best behaviour” - English Dictionary

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

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be on your best behaviour

to ​behaveextremely well and be very ​polite on a ​particularoccasion: 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 Learners Dictionary & Thesaurus © Cambridge University Press)
Translations of “be on your best behaviour”
in Chinese (Simplified) 举止得体, 以最好的表现示人…
in Chinese (Traditional) 舉止得體, 以最好的表現示人…
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