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 the edge of one's seat
- one's stamping grounds
- one's feet are on the ground
- one that got away
- on one's best behavior
- one in a hundred
- off to one side
- one's number is up
- off one's rocker
- one jump/step ahead of (someone or something)
- one's frame of mind
- in one fell swoop
- on one's chest
- at one time
- one (for someone)