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.
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Другие идиомы:
- odds are against one
- off to one side
- on one's own
- one-armed bandit
- two heads are better than one
- six of one and half a dozen of the other
- as one
- on one's shoulders
- one in a million
- one-track mind
- one sandwich short of a picnic
- off one's back
- out of one's hair
- one for the (record) books
- one after another