on one's best behavior
(быть) чрезвычайно вежливым
Пример использования идиомы on one's best behavior:
I told my son to be on his best behavior when we went to visit my friend.
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Другие идиомы:
- on one's heels
- one man's meat is another man's poison
- one sandwich short of a picnic
- on one's coat-tails
- one's frame of mind
- ten to one
- off one's back
- one up on (someone)
- one (for someone)
- one in a thousand
- two heads are better than one
- one's opposite number
- back to square one
- one little bit
- quick one