Alert-meaning and synonym with example.

Alert (n. & v.) - (अलर्ट )

Meaning :-- 

                 watching, listening etc. for something with all your attention.

                 A warning of possible danger.

                  सतर्क / चेतावनी देना 

Synonym :-- 

                     Attentive, To caution ,a warning of possible danger.

Example :--

                    One should be more alert while driving the vehicle at night.

                    The governor alerted the island residents of the storm.

                    A security guard must be alert at all time.