be alert

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Security Minister Dan Jarvis said people should be "alert and vigilant" but not "alarmed".

From BBC • Apr. 30, 2026

The Met had earlier promised an increased police presence in response to the protest, adding officers would be "alert to any behaviour that crosses the line from protest into criminality".

From BBC • Mar. 28, 2026

Nvidia earnings ought to quell any major AI fears for now, but investors need to be alert for signs of who will be the winners and the losers.

From Barron's • Feb. 26, 2026

Investors will be alert to comments from top executives about future AI activity which could impact stocks and markets.

From Barron's • Feb. 16, 2026

"Space travel is dangerous. They need to be alert and undistracted. They're sad that they lost a crewmate, but they'd be devastated if they found out they'd abandoned him alive."

From "The Martian" by Andy Weir