on best behavior
on (one's) best behavior
Being very polite or exercising exceptionally good manners. Primarily heard in US. Now, you kids must be on your best behavior for your Auntie this weekend! Good morning, class. I hope everyone was on their best behavior for the substitute teacher yesterday.
See also: behavior, on
Farlex Dictionary of Idioms.
on one's best behavior
being as polite as possible. When we went out, the children were on their best behavior. I try to be on my best behavior all the time.
See also: behavior, on
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
- on (one's) best behavior
- on one's best behavior
- be on (one's) best behavior
- be on (one's) good behavior
- on (one's) good behavior
- a whale of a
- bundle of energy
- think (someone) hung the moon and the stars
- lay out the welcome mat (for one)
- lay, put, roll, etc. out the welcome mat