consolidate
Definitions
To combine a number of things into a single, more effective or coherent whole.
To make a position or situation stronger or more secure.
To solidify or make physically hard or dense.
Examples
The company decided to consolidate its three regional offices into one central headquarters.
He worked hard to consolidate his power within the organization after the merger.
We need to consolidate our debts into a single monthly payment to make them easier to manage.