Symbolism, Imagery, Allegory
"Bleshing" is a neologism—an invented word, like webinar and Brangelina.
Bleshing expresses how the gestalt members live and act together when they're doing well. It could be described as a certain type of improvisatory group collaboration, where everyone forms a whole greater than its parts, such as when a band of musicians plays different instruments to make the same song.
But wait, there's more. Bleshing conveys a sense that the individual musicians, to continue with our previous example, all have an identity in common even as they remain distinct. Just as Lone and Janie and the rest all are the gestalt even though they're in separate bodies and minds:
Bleshing, that was Janie's word. She said Baby told it to her. She said it meant everyone all together being something, even if they all did different things. Two arms, two legs, one body, one head, all working together, although a head can't walk and arms can't think. Lone said maybe it was a mixture of 'blending' and 'meshing,' but I don't think he believed that himself. It was a lot more than that. (2.4.3)
So, bleshing expresses the unique way the gestalt lives together as an advanced life form.