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The phrase "on subject" is correct and commonly used in written English.
It is used to describe something that is relevant to the main topic being discussed. Example: The speaker stayed on subject throughout the presentation, providing relevant examples and statistics to support their argument.
Exact(58)
The response was unanimous: Columnists have almost inviolable free rein on subject matter.
Ideally, one of them should, based on subject matter knowledge, be chosen.
Quotes Princeton economist Uwe Reinhardt on subject.
There are no limitations on subject or length.
Nearly every playwright in town attended meeting on subject.
Thursday through next Sunday from 10 a.m. to 5 p.m. Prices vary depending on subject matter.
But it can certainly affect access, and has a profound influence on subject".
A: We've got to get away from a very, very narrow focus on subject knowledge.
Michael Gove is going the other way, to a bigger focus on subject knowledge.
Similar(2)
"And that is why I say it is not an add-on subject".
Remember rules like staying on subject?
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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