What does deep down mean?

phr. If you know or feel something deep down, you really believe it or feel it, even if you don't say it.

deep down

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Tags CEFR-B2

phrase

If you know or feel something deep down, you really believe it or feel it, even if you don't say it.

Deep down, I knew that I was right.

If you know or feel something deep down, you really believe it or feel it, even if you don't say it.