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coalesce
come together to form one mass or whole.
combine (elements) in a mass or whole.
e.g.
"the puddles had coalesced into shallow streams"
"to help coalesce the community, they established an office"
"Coalesce" is a less common word that may apply to natural processes such as water droplets, lakes, abstract concepts such as theories, and others.
"Merge" is a more common word. For code, merge is the only idiomatic option. Likewise for traffic, corporations, and many other subjects.
shallow stream
1 : not deep a shallow stream. 2 : taking in small amounts of air shallow breaths.
