プログレッシブ和英中辞典(第4版)の解説
もんぜん【門前】
門前に before [in front of] a gate
門前（に）市を成す
have many visitors; be prosperous
あの店は門前市をなす盛況だ
That store is 「doing a flourishing business [prospering].
門前の小僧習わぬ経を読む
learn something 「by watching [without being taught]
門前払い
彼に門前払いを食わされた
He shut [slammed] the door in my face.／He turned me away from his door.／He refused to see me.
門前町
a town [city] built originally in front of a temple [shrine]