I am trying to understand taṇhā, but it still somehow escapes me, even though it seems like such a simple term. In English, it is often translated simply as craving or desire — and left at that.
But in some explanations, taṇhā is described as a reaction to vedanā. For example, a pleasant contact arises, and the mind says, “I want more of this.” Yet taṇhā also seems to involve some kind of movement toward something. For instance, dissatisfaction with one’s husband may arise, and then the mind moves toward, “Let’s fix my husband.” To me, that also seems like taṇhā.
But then I start to wonder where exactly the boundary is. If a thirsty monk, who strongly wants to drink, drinks water on a hot day, is that also taṇhā? If someone strongly wants to free themselves from an addiction, is that taṇhā too? Is the desire to have a “good meditation” also taṇhā? I know people who suffered a great deal because they longed so much for some kind of good meditation.
Is the wish for happiness for one’s own child also taṇhā? Is the wish for peace in the world also taṇhā?
Please help me understand this “thing” that lies between vedanā and upādāna. What characteristics does something need to have for us to say, “this is taṇhā”?

