slå samman betyder på engelska

aggregate [aggregated, aggregating, aggregates]▼(To bring together; to collect into a mass or sum)
verb
[UK: ˈæ.ɡrɪ.ɡət] [US: ˈæ.ɡrə.ɡət]

join [joined, joining, joins]▼(to combine more than one item into one; to put together)
verb
[UK: dʒɔɪn] [US: ˌdʒɔɪn]

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