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Discover LudwigThe phrase "be deep in" is correct and can be used in written English.
It is a phrase that is used to emphasize an activity that one is engaged in. For example, you could say "I've been so deep in work that I haven't seen my family in weeks".
Dictionary
be deep in
adjective
Extending far away from a point of reference, especially downwards. physical distance
synonyms
Exact(52)
They'd all be deep in conversation".
Walks start from the door: you can be deep in the countryside within half a mile.
They would rather be deep in a few markets than thinly spread over many.
This year we appear to be deep in William Goldman country.
The kids in the pictures appear to be deep in the thrall of roles assigned to them by prom mythology.
If the deal dissolves as its stands now, half-realized, Tribune would still be deep in debt, though somewhat less so.
Similar(6)
(One would hope they're deep-in-the-pocket).
What area should I be deeper in?
The fair is deep in boats.
"His roots are deep in the earth".
"It's deep in their bones.
More suggestions(4)
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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