In hypnosis, there is a term called “deepener”.
As the word suggested, it is about deepening. It is a process of deepening the person in trance state.
One example could be:
Imagine you are at the beach lying down on the soft sand relaxing. The tide that comes on shore washes your body. With each washes, you will feel relaxed and more relaxed.
With each relaxation, you are deepening yourself into trance.