The famous doctor's clinic is packed with patients.
Tips
history
From 《战国策·齐策一》: advisor Zou Ji convinced King Wei of Qi to invite criticism. When rewards were offered, "群臣进谏，门庭若市" — officials came to remonstrate so densely that the palace gate was like a market.
mistakes
Antonym is 门可罗雀 (so empty you could trap sparrows at the door). Don't confuse with 人山人海, which describes crowds generally; 门庭若市 specifically refers to visitors at a door/shop/office.
