on one's best behavior
idiom
: behaving very politely and well
The children promised to be on their best behavior.
Dictionary Entries Near on one's best behavior
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“On one's best behavior.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/on%20one%27s%20best%20behavior. Accessed 5 Nov. 2024.
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