in deep Meaning If someone is 'in deep', they are deeply inv | English Language

in deep

Meaning
If someone is "in deep", they are deeply involved in a situation.

For example

Candy knew that she was in deep when she realised she was spending more time in Steven's apartment than she was in her own.

Before I knew it, I was in deep. I'd already invested fifty thousand dollars in the project, and I was thinking of investing even more.
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