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Discover LudwigThe phrase "a different subject altogether" is correct and usable in written English.
It can be used when transitioning to a completely separate topic or issue that is not related to the previous discussion.
Example: "While we were discussing the budget, the conversation shifted to a different subject altogether when we started talking about employee morale."
Alternatives: "a completely separate matter" or "an entirely different topic".
Exact(3)
Given the current state of popular opinion, he might understandably wish to choose a different subject altogether.
Which is not necessarily a bad thing, but that's a different subject altogether … Felicity Rubinstein is a literary agent and bookseller with Lutyens & Rubinstein.
(A more progressive tax rate would be a good second, but that's a different subject altogether).
Similar(56)
But when it comes to the subject and the message, Myers's book, which opens with endpapers of military camouflage fabric, is a different matter altogether.
Jackie Kennedy was a different matter altogether.
Chris Rea, though, is a different matter altogether.
Love scenes are a different matter altogether.
America was a different matter altogether.
Warm hummus is a different matter altogether.
But the Mail is a different matter altogether.
Mercosur, however, is a different case altogether.
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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