on their best behavior
idiom
: exhibiting proper behavior
The children were all on their best behavior at the museum.
Examples of on their best behavior in a Sentence
Recent Examples on the Web
Jeff John Roberts Big TechSocial Media Larry Ellison once predicted ‘citizens will be on their best behavior’ amid constant recording.
—
Orianna Rosa Royle, Fortune, 30 Sep. 2025
Polk County Sheriff Grady Judd said tourists are welcome in the county, but they are expected to be on their best behavior.
—Elizabeth Pritchett, FOXNews.com, 5 Aug. 2025
The thousands of Floridians expected to march in the No Kings National Day of Defiance on Saturday had better be on their best behavior, warned Florida’s governor.
—Charles Rabin, Miami Herald, 13 June 2025
Plus, most potential partners are on their best behavior early on.
—Christina Pérez, Vogue, 12 Apr. 2025
See All Example Sentences for on their best behavior
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Orianna Rosa Royle, Fortune, 30 Sep. 2025
Polk County Sheriff Grady Judd said tourists are welcome in the county, but they are expected to be on their best behavior.
—Elizabeth Pritchett, FOXNews.com, 5 Aug. 2025
The thousands of Floridians expected to march in the No Kings National Day of Defiance on Saturday had better be on their best behavior, warned Florida’s governor.
—Charles Rabin, Miami Herald, 13 June 2025
Plus, most potential partners are on their best behavior early on.
—Christina Pérez, Vogue, 12 Apr. 2025
See All Example Sentences for on their best behavior
Cite this Entry
“On their best behavior.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/on%20their%20best%20behavior. Accessed 4 Oct. 2025.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
Share