警惕 (jǐngtì): to be vigilant

Meanings

Chūmén zài wài yào tígāo jǐngtì.

Be more vigilant when you're out and about.

Wǒmen yào jǐngtì wǎngluò zhàpiàn.

We should be on guard against online fraud.

usage

提高警惕 (raise one's vigilance) is a very common collocation.

警 jǐng

惕 tì