coalesce
koh-uh-LESverbMeaning to come together to form one whole
Memory hook co-ALL-esce: ALL together as one. Dozens of little fish swim closer and closer until they move like one big fish. When separate parts join into a single whole, they coalesce.
Tiny raindrops coalesced into one fat drop at the edge of the roof.
In context At first the volunteers worked in scattered groups, but over the summer they coalesced into one well-organized team with a single plan.
Similar merge, unite, combine, fuse
Opposite separate, divide, split
From Latin coalescere, “to grow together”: co (together) + alescere (to grow up).