expression, godan verb (-su)
form a crowd; draw a crowd
Describes a place becoming crowded with people, often implying a lively gathering or market-like atmosphere.
祭りの日には、神社の前に多くの人が集まり、ちょっとした市を成す。
On festival days, many people gather in front of the shrine, forming something of a crowd.
新しくできたパン屋の前には、毎朝行列ができて市を成している。
Every morning, a line forms in front of the new bakery, creating a crowd.