be on (one's) best behavior

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be on (one's) best behavior

To be very polite or exercise exceptionally good manners. Primarily heard in US. Now, you kids must be on your best behavior for your Auntie this weekend! Good morning, class. I hope everyone was on their best behavior for the substitute teacher yesterday.
See also: behavior, on
References in periodicals archive ?
Saturday night we were told by Think TM Matt McGinley to be on our best behavior, 'cause the bosses Greg Carroll and Bruce Rodella (who were footing my bill) were flying in to support their team.