phrase. If you know something deep down or deep down inside, you know that it is true, but you are not always conscious of it or willing to admit it to yourself. We knew deep down that we could do it.

What deep down means?

—used to mean that something is true or real even if it is not said or shown to other people He knew deep down inside that she was right. Deep down, I think we all felt the same way.

What does love you deep down mean?

felt strongly and often hidden from other people: Deep down, I know you love me really.