be on your guard
成語所屬單字guard
be on your guard — 慣用語
1. To be very careful and ready for something difficult or dangerous.
1.慣用語
釋義
保持警覺
To be very careful and ready for something difficult or dangerous.
例句
Min was on her guard when the stranger approached her.
Are you on your guard against pickpockets in crowded places?