be good

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be good

1. A set phrase urging one to behave. Kids, please be good for your grandparents this weekend.
2. A valediction. All right, see you next week. Be good!
See also: good
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

Be good.

a departure response meaning "good-bye and behave yourself." Jane: Well, we're off. Be back in a week. Mary: Okay, have fun. Be good. Jane: Do I have to? Tom: Bye. Be good. Bill: See you next month.
See also: good
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
See also: