An example of alert is the doctor who takes a quick nap before his next surgery so that he is well rested and ready to perform at a high level of awareness.
A mother who is at an airport with her children constantly keeping an eye on where they are and requesting they stay close is an example of someone who is being alert.
An example of an alert are tornado sirens going off when a possible twister is headed in that direction.
When a person runs from door to door ringing bells and shouting about a fire, it is an example of alerting a neighborhood to danger.
Alert to danger; an alert bank guard.
Sirens sounded the alert for an air raid.
A flashing red light that alerted motorists to trouble ahead.
The bird's alert hopping from branch to branch.
An alert to drivers about a detour.
The troops were alerted.
We alerted them to their duties.
When a woman is walking down a dark alley at night and keeps checking behind her, it is an example of alert.
Nuclear-armed bombers were put on alert during the crisis.
- Watchful and prepared for danger, emergency, or opportunity:Bird watchers on the alert for a rare species.
- watchful; vigilant
Origin of alert
From American Heritage Dictionary of the English Language, 5th Edition