Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
all at once
Grammar usage guide and real-world examplesUSAGE SUMMARY
"all at once" is correct and usable in written English.
You can use it when you want to emphasize that something happens suddenly or without warning. For example, "We heard a loud crash and all at once the room was filled with smoke."
✓ Grammatically correct
News & Media
Wiki
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
59 human-written examples
Don't try all at once.
News & Media
Then sun — all at once.
News & Media
Sometimes all at once.
News & Media
all at once.
News & Media
All at once my irritation passed.
News & Media
In many places, all at once.
News & Media
Dishes tend to arrive all at once.
News & Media
He had all at once deflated.
News & Media
Dangerous and surplus all at once.
News & Media
Often, it feels like, all at once.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
1 human-written examples
Earthquakes are those all-at-once releases.
News & Media
Expert writing Tips
Best practice
Use "all at once" to effectively describe situations where multiple events occur simultaneously or a sudden change happens, adding emphasis to the unexpected nature of the situation. For example, "The lights went out and all at once, the room was plunged into darkness."
Common error
Avoid using "all at once" to describe gradual or incremental changes. This phrase is best reserved for instances where the change is immediate and unexpected. For example, don't say "The company grew all at once," when the growth happened over several years.
Source & Trust
77%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The adverbial phrase "all at once" functions primarily as an adverb modifying a verb or clause. It indicates the manner or timing of an action, emphasizing its sudden or simultaneous nature. Ludwig confirms its correctness and usability.
Frequent in
News & Media
44%
Wiki
27%
Science
9%
Less common in
Formal & Business
7%
Encyclopedias
0%
Social Media
0%
Ludwig's WRAP-UP
In summary, the adverbial phrase "all at once" is a correct and commonly used expression to describe events that occur suddenly or simultaneously. Ludwig confirms its validity and provides numerous examples across various contexts, primarily in News & Media and Wiki sources. While it is crucial to use it appropriately to convey sudden or simultaneous actions rather than gradual processes, its versatility makes it a valuable addition to effective communication.
More alternative expressions(10)
Phrases that express similar concepts, ordered by semantic similarity:
all of a sudden
Directly conveys the unexpected nature of an event or change.
suddenly
Focuses on the abruptness of the event, lacking the connotation of simultaneity.
in a flash
Emphasizes the rapid and brief duration of an event.
abruptly
Focuses on the sudden and unannounced nature of an event.
unexpectedly
Emphasizes the surprise element, but does not necessarily imply that multiple things happened together.
simultaneously
Highlights that multiple events occurred at the same time, without necessarily implying surprise.
at the same time
A more literal way to express simultaneity, often used in less formal contexts.
in unison
Implies coordinated action, where multiple entities act together at the same moment.
instantaneously
Highlights the speed and immediacy of the occurrence, often used in technical contexts.
at one fell swoop
Suggests that something is accomplished quickly and efficiently, often with a sense of finality.
FAQs
What does "all at once" mean?
The phrase "all at once" means suddenly or simultaneously. It's used to describe something that happens quickly and unexpectedly or when multiple things occur at the same time.
How can I use "all at once" in a sentence?
You can use "all at once" to describe a sudden change or simultaneous events. For example, "All at once it came to me" or "All at once, everyone had gone home.
What can I say instead of "all at once"?
You can use alternatives like "suddenly", "unexpectedly", or "simultaneously" depending on the specific context you wish to convey.
Is it correct to say "at all once" instead of "all at once"?
No, "at all once" is not a correct or standard English phrase. The correct phrase is "all at once", which means suddenly or simultaneously.
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Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
77%
Authority and reliability
4.5/5
Expert rating
Real-world application tested