a one off

USAGE SUMMARY

"a one off" is a correct and commonly used phrase in written English.
It means something that is unique or one-of-a-kind, not part of a series or recurring. Example: "The painting was a one off, created by the artist for a special exhibition and never to be reproduced again."

✓ Grammatically correct

News & Media

Science

Human-verified similar examples from authoritative sources

Similar Expressions

60 human-written examples

He was a one-off".

BBC

This isn't a one-off".

Independent

This was not just a one-off".

The New York Times

"He's a one-off special person.

Independent

But it was not a one-off.

The Economist

But this was just a one-off.

Independent

Nor will this be a one-off.

The Economist

Henry is a one-off among eccentrics.

The New York Times

It was a one-off case".

Independent

what a one-off Margaret Thatcher was.

Independent

Few think that was a one-off.

The Economist

Expert writing Tips

Best practice

Use "a one off" to emphasize the uniqueness or non-repeatable nature of an event, item, or situation. For instance, describe a handmade product as "a one off" to highlight its individuality.

Common error

Avoid using "a one off" in highly formal contexts where more sophisticated vocabulary might be expected. In academic papers or official reports, alternatives such as "unique occurrence" or "isolated instance" may be more appropriate.

Linguistic Context

The phrase "a one off" functions primarily as an adjectival phrase modifying a noun. It describes something as being unique, singular, or not part of a series. As Ludwig AI confirms, it is commonly used in written English to denote uniqueness.

Expression frequency: Very common

Frequent in

News & Media

69%

Science

14%

Formal & Business

3%

Less common in

Wiki

2%

Reference

0%

Social Media

0%

Ludwig's WRAP-UP

The phrase "a one off" is a common and grammatically correct way to describe something unique and non-recurring, as confirmed by Ludwig AI. Predominantly found in News & Media and Science contexts, the phrase emphasizes singularity and is generally considered neutral to informal in register. While acceptable in a variety of settings, more formal alternatives may be preferred in academic or professional writing. This analysis, combined with numerous examples, highlights the phrase's consistent meaning and broad applicability.

More alternative expressions

Phrases that express similar concepts, ordered by semantic similarity:

a unique occurrence

Focuses on the singularity of the event or situation.

a singular instance

Emphasizes the isolated and individual nature of the event.

a solitary event

Highlights the fact that it's an isolated occurrence, unlikely to be repeated.

a non-recurring event

Stresses the lack of repetition or continuation.

a standalone case

Suggests it is independent and not part of a pattern.

a once-in-a-lifetime opportunity

Highlights the rarity and specialness of the event.

a freak event

Implies that the event was unusual and unexpected.

an exceptional case

Indicates that the instance is out of the ordinary.

a rare exception

Presents the situation as diverging from the norm.

an isolated incident

Highlights that the event is separated and unconnected to others.

FAQs

How can I use "a one off" in a sentence?

You can use "a one off" to describe something unique and not repeatable. For example, "This design is "a one off", you won't find it anywhere else".

What's a more formal alternative to "a one off"?

In formal writing, consider using phrases like "unique occurrence" or "isolated incident" instead of "a one off" to maintain a professional tone.

Is "a one off" the same as "unique"?

While similar, "a one off" specifically implies that something is made or happens only once, whereas "unique" simply means it's distinct or special in some way. "Unique" doesn't necessarily mean it's non-repeatable.

When is it appropriate to use "a one off"?

It's appropriate to use "a one off" in both informal and neutral contexts when you want to emphasize that something is singular and not part of a series. For example, “The concert was "a one off" for the charity”.