on guard

USAGE SUMMARY

"on guard" is a correct and usable phrase in written English.
You can use it to refer to someone who is on watch or keeping a vigilant eye on something. For example, "The sentry was on guard at all times, ensuring no one snuck past the borders."

✓ Grammatically correct

News & Media

Academia

Wiki

Human-verified examples from authoritative sources

Exact Expressions

59 human-written examples

Knowing one exists can put an audience on guard.

The New York Times

It's being on guard".

The New Yorker

So, be on guard.

The New York Times - Health

I'm constantly on guard".

The New York Times

Others are on guard duty.

The New York Times

I felt relentlessly on guard.

The New York Times

But I was on guard.

The New York Times

Stay on guard.

Harvard University

"I'm always on guard," he said.

The New York Times - Food

We have to be on guard".

The New York Times

Human-verified similar examples from authoritative sources

Similar Expressions

1 human-written examples

Stand the on-guard position.

WikiHow

Expert writing Tips

Best practice

Consider the context to choose a synonym if "on guard" feels too informal or too specific. Alternatives like "vigilant" or "alert" may be more appropriate in formal settings.

Common error

Avoid using "on guard" when the situation calls for proactive action. "On guard" implies a defensive posture, while active problem-solving requires initiative. In those cases, consider phrases like "taking charge" or "addressing the issue".

Linguistic Context

The phrase "on guard" primarily functions as an adjective phrase, modifying a noun or pronoun to describe a state of vigilance or readiness. Ludwig AI confirms that "on guard" is correct and usable in written English to refer to someone who is on watch or keeping a vigilant eye on something. Examples from Ludwig illustrate its use in various contexts, from soldiers on duty to individuals being cautious.

Expression frequency: Very common

Frequent in

News & Media

65%

Academia

15%

Wiki

10%

Less common in

Formal & Business

5%

Science

3%

Reference

2%

Ludwig's WRAP-UP

In summary, the phrase "on guard" functions as an adjective phrase that describes a state of vigilance and preparedness. Ludwig AI indicates its broad acceptability in English writing. It is frequently used in News & Media, Academia, and Wiki sources, indicating a neutral register. Related phrases include "vigilant", "alert", and "on the lookout", offering nuanced alternatives. When using "on guard", ensure the context aligns with its defensive implication, avoiding its use when proactive action is required. The phrase enjoys a high level of expert approval due to its grammatical correctness, source authority, and consistent usage.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

on high alert

Indicates a heightened state of readiness and awareness.

on the alert

A more emphatic way of saying "alert".

on the lookout

Emphasizes the act of actively searching for potential threats.

vigilant

Single word replacement that emphasizes watchfulness.

keeping watch

More descriptive, highlighting the continuous nature of observation.

alert

Single word replacement focusing on quick responsiveness.

watchful

Similar to "vigilant" but can imply a more caring or protective aspect.

cautious

Implies a degree of hesitation and careful consideration.

ready

Focuses on preparedness rather than watchfulness.

prepared

Similar to "ready" but with a stronger implication of prior planning.

FAQs

How can I use "on guard" in a sentence?

You can use "on guard" to describe someone who is watchful and prepared for potential danger or surprises. For instance, "The security team remained "on guard" throughout the night".

What are some alternatives to saying "on guard"?

Depending on the context, you can use alternatives like "vigilant", "alert", or "watchful" to convey a similar meaning.

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

Both phrases are correct, but "be on guard" is generally used as an initial instruction, while "stay on guard" emphasizes the need for continued vigilance over a period of time.

What does it mean to be "on guard against" something?

To be "on guard against" something means to be watchful and prepared to defend against a specific threat or problem. For example, "We must be "on guard" against misinformation".