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Discover LudwigThe phrase "a knockout blow" is correct and usable in written English.
It is typically used in contexts where a decisive or overwhelming action is taken, often in sports or competitive situations, but can also apply metaphorically in arguments or debates.
Example: "The final argument presented by the lawyer was a knockout blow that left the jury with no doubt about the defendant's guilt."
Alternatives: "a decisive blow" or "a crushing blow".
Exact(60)
If Mitt Romney is looking for a knockout blow there, he might not find it.
But there was never a knockout blow.
Although neither landed a knockout blow".
The price was almost a knockout blow.
But neither side has found a knockout blow.
"Apple cannot deal a knockout blow to Samsung".
Its 445 pages fail to deliver a knockout blow.
It's not a knockout blow, but at least you know where you are with "third rate".
Unlike the one delivered by Stevenage, then, it was not a knockout blow.
He said the governor's lack of a knockout blow did not matter.
She grins knowing that it's a knockout blow and I've lost – but she is right.
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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