This is an old thread I realize. But as a BOTA member I can add some comments, without sharing directly from lessons. I am working with this card at present in my life, and only with the BOTA one in particular, as it is a bit different from all the other Death cards.
This is about renewal. Not just about Death. It is helpful sometimes to realize that a title of a card can be illuminated by reading it as its opposite. So an alternate title to this card is Birth. Gestation in the womb leads to the end of the time there. And the end of that cycle is Birth. When we are born, it is the death of our time as a fetus.
The Hebrew letter for this card is Nun which means "fish". A seed, or sperm is a kind of fish. When it is planted, that is the death of its time as potential, and the beginning of its time as manifestation. Likewise, if you have an idea, that is like a seed, in your mind. You might have an idea to knit an afghan. But if you make the afghan, the idea dies. Instead what is left is the living manifestation of what that idea was or life. A wonderful image for this is the Rider Waite Page of Cups. The Page holds a cup from which issues forth a fish. From the Love Power...this creativity and giving of seeds...comes Life and Birth. Think of the cup as a womb and the fish as that which is born. When life comes forth, the seed then dies and what is left is the Form that it has assumed as a living thing.
Another image that helps is the crayfish which crawls out of the pool in "the Moon". That fish that is crawling out was caught in the previous card, The Star, because the Star is Tzaddi, the fish-hook. In this instance, what we have is a sense that what was worked at interiorly manifests corporeally in the body. This refers to physical changes that one looks for in relation to "The Great Work".