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be on your best behaviour

Idiom732/1,085

to behave in the most polite way you can

Heard in 2 movies · Mary Poppins
Now, remember. Be on your best behaviour.
Mary Poppins (1964)88:07
Idioms · 732 of 1,085
    be on your best behaviour meaning & examples · 2 movie clips · from Mary Poppins (1964)