keep one's guard up

English

keep one's guard up

To be careful and alert to the possibility of danger.
Synonym: have one's guard up

单词	keep one's guard up
释义	keep one's guard up English Verb keep one's guard up To be careful and alert to the possibility of danger. Synonym: have one's guard up References “keep%20one%27s%20guard%20up” in Merriam–Webster Online Dictionary.
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