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Discover Ludwig"that was that" is correct and usable in written English.
It is an idiomatic expression and usually used to bring something to an end. For example: "We were both exhausted after the long argument, so I said 'that was that' and we never spoke about it again."
Dictionary
that was that
verb
Simple past tense of that's that
Exact(30)
When he did, that was that".
"That was that," he recalls.
That was that: friends for life.
"And that was that?" I asked.
"And that was that," she answered.
So that was that really.
Similar(30)
And that's that, you know?" No.
That's that classic diva dynamic.
That's that lambda.
So that's that cleared up, then.
"So that's, that's huge".
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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