English Dictionary

keep one's guard up

動詞

To be careful and alert to the possibility of danger.

日本語の意味

用心深く、警戒心を失わずにいること / 常に油断せず、危険に備えている状態

On nights like this, it's smart to keep one's guard up when walking alone.

こんな夜は、一人で歩くときは常に警戒しておくのが賢明だ。

意味（1）

To be careful and alert to the possibility of danger.

keeps one's guard up （ present singular third-person ）

keeping one's guard up （ participle present ）

kept one's guard up （ participle past ）

kept one's guard up （ past ）