on their best behavior

idiom

Definition of on their best behavior

: exhibiting proper behavior The children were all on their best behavior at the museum.

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Dictionary Entries Near on their best behavior

on the inside

on their best behavior

on-the-job

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Cite this Entry

“On their best behavior.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/on%20their%20best%20behavior. Accessed 25 Jan. 2022.

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