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:
- on one's high horse
- One person's trash is another person's treasure.
- out of the corner of one's eye
- one good turn deserves another
- on one's toes
- one's frame of mind
- on one's own
- one or two
- one (for someone)
- one jump/step ahead of (someone or something)
- off to one side
- all in one piece
- look after number one
- one foot in the grave
- one and the same