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

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 1 Dec. 2024.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!