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:
- off one's chest
- on one's chest
- One person's trash is another person's treasure.
- one's days are numbered
- two heads are better than one
- take care of number one
- one thing leads to another
- as one
- one of the boys
- one that got away
- one's number is up
- one to a customer
- off one's back
- look after number one
- one in a hundred