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Discover LudwigThe phrase "that is to" is correct and usable in written English.
It is used to indicate a relationship between two ideas, as in "She needs to finish her assignments, that is to say, she needs to complete them by the end of the month."
Exact(59)
You could, that is to say, lie.
Cheated, that is to say.
That is to be welcomed.
That is to say, fairly.
Reasons, that is, to linger.
Now that is to stop.
That is to recognise reality.
That is to Obama's credit.
That is to be applauded.
"That's what that is to me".
Similar(1)
That is to say, he doesn't.
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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