coalesce

ˌkəʊəˈlɛs

verb

come together to form one mass or whole.

the puddles had coalesced into shallow streams

unite,join together,combine,merge,fuse,mingle,meld,blend,intermingle,knit (together),amalgamate,consolidate,integrate,affiliate,link up,homogenize,synthesize,converge,commingle,commix