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Discover LudwigThe phrase "that's that" is correct and can be used in written English.
It is typically used to emphatically indicate that something is settled. For example, "I think we've discussed this topic at length, that's that."
Dictionary
that's that
phrase
There is nothing more to say or to do concerning the matter.
synonyms
Exact(49)
There's no other structure that's that big".
"That's that world, folks".
"That's that Indian self-sacrifice".
That's that classic diva dynamic.
So that's that sorted.
That's that covered.
Similar(9)
"There is nothing that is that unique".
When he did, that was that".
"That was that," he recalls.
That was that: friends for life.
"And that was that?" I asked.
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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