on one's best behavior

idiom

Definition of on one's best behavior

: behaving very politely and well The children promised to be on their best behavior.

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Dictionary Entries Near on one's best behavior

on one's ass

on one's best behavior

on one's breath

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Cite this Entry

“On one's best behavior.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/on%20one%27s%20best%20behavior. Accessed 28 Sep. 2021.

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