expression, godan verb (-su)
have many visitors; be bustling with callers
Idiomatic expression describing a home or shop that is so popular that a crowd gathers in front, like a marketplace. Often used for a prosperous business or a famous person's residence.
彼の家はいつも門前市をなしている。
His house is always bustling with visitors.
あの店は開店以来、門前
That shop has been so popular since it opened that it's like a marketplace in front.