What is in deep?

"In deep" is a phrase that is often used to describe a state of seriousness, intensity, or thoroughness. It can refer to being deeply involved or committed to something, being in a state of deep thought or contemplation, or being immersed in a particular experience or environment.

In the context of relationships, it can refer to being emotionally invested and deeply connected to someone. It can also refer to going into great detail or exploring something to a significant degree, such as conducting in-depth research or analysis.

Overall, being "in deep" usually implies a high level of engagement, focus, and commitment to a particular task or situation.