объединяться означает в английский

coalesce [coalesced, coalescing, coalesces]▼(to join into a single mass)
verb
[UK: ˌkəʊə.ˈles] [US: ˌkoʊə.ˈles]

merge [merged, merging, merges]▼((intransitive) to combine into a whole)
verb
[UK: mɜːdʒ] [US: ˈmɝːdʒ]

unify [unified, unifying, unifies]▼(become one)
verb
[UK: ˈjuː.nɪ.faɪ] [US: ˈjuː.nə.ˌfaɪ]

unite [united, uniting, unites]▼((reciprocal) to come together as one)
verb
[UK: ju.ˈnaɪt] [US: ju.ˈnaɪt]