consolidate

consolidate verb uk/kənˈsɒlɪdeɪt/ us consolidate verb
(COMBINE)

to combine several things, especially businesses, so that they become more effective, or to be combined in this way

объединять
He consolidate d his businesses into one large company. consolidation noun [ U ] uk/kənˌsɒlɪˈdeɪʃən/ us

укрепление, объединение