This is the 12975th most frequent German word.
zusammenwachsen
To grow together.
Here, 'zusammenwachsen' is used figuratively to describe the process of two entities merging or becoming closer over time.
Die zwei Städte begannen, durch gemeinsame Projekte zusammenzuwachsen.
The two cities started to grow together through joint projects.
In this context, 'zusammenwachsen' is describing the physical process of tissues or bones healing and joining.
Nach der Operation mussten die Knochen wieder zusammenwachsen.
After the operation, the bones had to grow together again.
'Zusammenwachsen' is used figuratively to illustrate the integration or building of cohesion within groups.