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on one's best behavior
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Idioms and Phrases
Also, on one's good behavior . Very polite, as in Mother told the children to be on their best behavior during Grandma's visit , or The whole staff were on their good behavior while the client inspected the premises . [Late 1600s]Advertisement
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
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