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Discover LudwigThe phrase "in a flash." is correct and usable in written English.
It is typically used to describe something happening very quickly or instantaneously. Example: "She completed the task in a flash, impressing everyone with her speed."
Dictionary
in a flash.
adverb
Very quickly
synonyms
Exact(60)
It happened in a flash.
All in a flash".
Gone in a flash.
Then, in a flash, it dissipated.
Three break points gone in a flash.
Even Hiroshima whizzes by in a flash.
The spectacle went by in a flash.
— in a flash of shock and awe".
On the screen in a flash.
This one just went in a flash.
He caught her arm in a flash.
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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