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The phrase "doubt on" can be correct and usable in written English, but it is not a commonly used phrase. It is more common to say "doubt about" or "doubt concerning." However, "doubt on" can be used when describing a feeling of uncertainty or hesitation about a particular subject or situation. Example: There was a doubt on whether the results of the experiment were accurate or not.
Exact(60)
The tests cast doubt on one relationship and proved another.
There is no doubt on this one.
Meselson cast doubt on it.
But recent research casts doubt on it.
April 2nd throws doubt on that perspective.
We cast doubt on this assumption.
And, no doubt, on streets.
Our findings cast doubt on this argument.
This casts doubt on anybody's awards.
Others cast doubt on that assertion.
"People were casting doubt on our review.
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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