be on alert

USAGE SUMMARY

"be on alert" is a correct and usable phrase in written English.
It means to be watchful, vigilant, or prepared for potential danger or problems. It can be used in various contexts, such as giving warnings, instructions or describing a state of awareness. Example: After the recent natural disasters, the city has issued a warning for residents to be on alert for potential aftershocks. The security team was on alert after receiving reports of a potential threat to the building. When hiking in the wilderness, it is important to be on alert for any signs of wild animals. During the exam, the students were on alert for any unexpected questions or changes in the test format.

✓ Grammatically correct

News & Media

Academia

Human-verified examples from authoritative sources

Exact Expressions

60 human-written examples

Where my son has to be on alert, always, since he is one of the good guys.

HuffPost

"We are going to be on alert".

The New York Times - Tech

Some 7,000 police will be on alert.

The Economist

You've got to be on alert.

The New York Times - Travel

I will be on alert until the last minute".

Independent

Television networks around the world will be on alert.

The New York Times - Sports

Black and Asian fans of England were urged to be on alert by British officials.

The New York Times - Sports

And his team will be on alert should repairs be needed during play.

Harvard University

"We've asked officers to be on alert for any suspicious activity in or around hospitals.

The New York Times

"But I think all of us have to be on alert," he continued.

The New York Times

To be on alert for it, somehow, every day of your life.

The New York Times - Books

Expert writing Tips

Best practice

When using "be on alert", ensure that the context clearly indicates what potential threats or issues one should be vigilant about. Specify the subject of the alert to give a clear indication of any potential danger.

Common error

Avoid using "be on alert" without specifying the reason for the heightened awareness. Ensure that the audience understands the specific threat or situation they should be vigilant about.

Linguistic Context

The phrase "be on alert" primarily functions as an idiomatic expression that serves as a directive or recommendation. According to Ludwig, the phrase is correct and usable in written English, which confirms its grammatical acceptance.

Expression frequency: Very common

Frequent in

News & Media

66%

Academia

10%

Wiki

8%

Less common in

Formal & Business

3%

Science

1%

Reference

0%

Ludwig's WRAP-UP

The phrase "be on alert" is a common and grammatically correct expression used to advise or instruct someone to be watchful and prepared for potential dangers or threats. Ludwig AI confirms its usability in various contexts. It is frequently found in news and media sources, indicating its relevance in communicating potential risks to a broad audience. While highly versatile, it's best practice to specify what one should "be on alert" for to avoid vagueness and ensure clear communication. Alternative phrases like ""be vigilant"" or ""exercise caution"" can be used depending on the specific nuance desired.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

be vigilant

Emphasizes watchfulness and attentiveness to potential dangers or issues.

stay vigilant

Suggests maintaining a state of alertness over a period of time.

maintain vigilance

Highlights the necessity of keeping a sustained state of alertness.

be watchful

Highlights the act of observing carefully and attentively.

remain watchful

Implies a continuous state of careful observation.

be prepared

Focuses on the act of getting ready and equipped for potential events or situations.

be on the lookout

Focuses on actively searching for something or someone.

keep a close watch

Highlights the act of monitoring something or someone closely.

exercise caution

Advises taking steps to minimize risks and avoid potential problems.

be aware

Emphasizes having knowledge or perception of a situation or potential issue.

FAQs

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

You can use "be on alert" to advise someone to be watchful or vigilant for potential dangers or problems. For example, "Residents should be on alert for potential flooding" or "Security personnel need to be on alert for suspicious activity".

What are some alternatives to "be on alert"?

Some alternatives to "be on alert" include "be vigilant", "be watchful", or "exercise caution", depending on the specific context.

Is it better to say "be on alert" or "stay on alert"?

Both phrases are grammatically correct, but "stay on alert" often implies maintaining a state of vigilance over a longer period, while "be on alert" can refer to a more immediate or temporary state of awareness.

What does it mean to "be on alert"?

To "be on alert" means to be in a state of heightened awareness and readiness, typically in anticipation of potential danger, threats, or problems. It means being vigilant and prepared to react if necessary.