on one's guard
осторожный, бдительный
Пример использования идиомы on one's guard:
I saw that Tim was on his guard, but I didn't know the reason of his cautiousness.
Комментарии:
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Другие идиомы:
- one foot in the grave
- do (someone) one better
- not one iota
- one-night stand
- one sandwich short of a picnic
- at one time
- one of those things
- on one's feet
- six of one and half a dozen of the other
- out of one's shell
- as busy as a one-armed paperhanger
- one way or another
- off one's rocker
- on one's shoulders
- open one's heart to (someone)