Translation of "be on (your) guard" - English-Mandarin Chinese dictionary

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be on (your) guard

C2 to be careful to avoid being tricked or getting into a dangerous situation

警惕;提防;警戒
You always have to be on your guard against pickpockets. 你得时时提防扒手。

(Translation of “be on (your) guard” from the Cambridge English-Chinese (Simplified) Dictionary © Cambridge University Press)