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:
- at one time
- one or two
- one's bark is worse than one's bite
- one of those things
- on one's guard
- thousand and one
- back to square one
- out of one's element
- off the top of one's head
- two heads are better than one
- one's stamping grounds
- one of the boys
- one's feet are on the ground
- one to a customer
- quick one