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Discover LudwigThe phrase "you know it" is correct and can be used in written English.
It is often used as an affirmative response when someone affirms something or to show agreement. For example: A: I'm going to make dinner tonight. B: You know it!.
Dictionary
you know it
interjection
Indicates agreement, approval, encouragement.
Exact(59)
Sure, you know it.
You know, it happens.
Do you know it?
Wouldn't you know it?
"Long as you know it".
"You know it?" he asked.
You know it as Coleco.
"You know, it was horrific..."...
Greenfield Avenue — you know it?
You know, it was therapeutic.
And wouldn't you know it?
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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