be on the alert

USAGE SUMMARY

"be on the alert" is a correct phrase and can be used in written English.
It means to be watchful, cautious, and prepared for possible danger or trouble. Example: The police warned the public to be on the alert for any suspicious activity in the neighborhood after a string of break-ins occurred.

✓ Grammatically correct

News & Media

Science

Formal & Business

Human-verified examples from authoritative sources

Exact Expressions

58 human-written examples

When a superior officer is spotted in the area, the soldiers warn one another by cellphone to be on the alert.

The New York Times

Always be on the alert for the sly joke, the one-liner and outright slapstick.

The Guardian - Books

"Yes, but we've got to be on the alert".

The Guardian

Residents are advised to be on the alert.

The New York Times

There's a need always to be on the alert".

The Guardian

Russia always has to be on the alert, on the defensive".

The New York Times

Be on the alert for the start of these symptoms, and then divide the grasses.

The New York Times

"We're going to be on the alert for additional remains," he said.

The New York Times

Mr. Ridge's advice: Be on the alert for something he can't tell us about.

The New York Times

Charities and their trustees are required to be on the alert to the threat of terrorism.

The Guardian

But the C.D.C. has asked state health departments nationwide to be on the alert for cases among gay men.

The New York Times - Health

Expert writing Tips

Best practice

Use "be on the alert" when you want to emphasize the need for vigilance and readiness in response to potential threats or important developments. It's particularly effective in contexts where proactive monitoring is essential.

Common error

Avoid using "be on the alert" in everyday, casual conversations. It can sound overly formal or dramatic. Instead, use more relaxed alternatives like "keep an eye out" or "stay aware".

Linguistic Context

The phrase "be on the alert" functions as an idiomatic expression used to advise or instruct someone to be vigilant and watchful. Ludwig AI confirms this expression follows standard English grammar rules.

Expression frequency: Very common

Frequent in

News & Media

65%

Science

15%

Wiki

8%

Less common in

Formal & Business

7%

Reference

3%

Encyclopedias

2%

Ludwig's WRAP-UP

In summary, the phrase "be on the alert" is a grammatically correct and frequently used idiomatic expression that advises vigilance and readiness. Ludwig AI confirms its validity. Primarily found in news and media, it serves to warn or instruct individuals to remain watchful for potential threats or important developments. While highly suitable for formal contexts, it should be used judiciously in casual conversation. Alternatives such as "keep an eye out" or "stay aware" may be more appropriate in informal settings.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

be on the lookout

This closely mirrors the original phrase, implying a state of actively searching for something specific.

be watchful

This focuses on observing potential threats or changes, fitting contexts that demand close monitoring.

be on guard

This implies protection or defense from potential danger, useful in situations with high risk.

be vigilant

This alternative emphasizes a state of watchfulness and careful observation, suitable in situations where sustained attention is required.

keep an eye out

This is more informal and refers to general observation, appropriate for casual situations.

maintain awareness

This emphasizes the importance of remaining cognizant of one's surroundings or specific situations.

be prepared

This stresses readiness to act if something happens, useful when action may be necessary.

exercise caution

This advises careful behavior and a level of prudence, useful for situations that require sensitivity.

be attentive

This suggests actively listening and being aware of surrounding details, suitable for situations that require focus.

stay informed

This suggests keeping up to date with relevant information to make educated decisions, suitable for situations where knowledge is key.

FAQs

How can I use "be on the alert" in a sentence?

You can use "be on the alert" to advise someone to be watchful and prepared for potential danger or issues. For example, "Travelers should "be on the alert" for pickpockets in crowded areas".

What is a more informal way to say "be on the alert"?

Informal alternatives to "be on the alert" include "keep an eye out" or "stay aware". These options are more suitable for casual conversations.

When is it appropriate to use "be on the alert"?

"Be on the alert" is suitable when you want to emphasize the need for heightened vigilance and readiness, especially when there is a potential for danger or unexpected events. It is often used in official warnings or serious contexts.

What's the difference between "be on the alert" and "be aware"?

"Be aware" implies a general understanding of something, while "be on the alert" suggests a more proactive state of readiness and vigilance. "Be on the alert" implies a potential threat or situation that requires active monitoring.