noun
restaurant with long lines; popular eatery
Colloquial term for a restaurant so popular that customers regularly queue outside.
あのラーメン屋は有名な行列店で、いつも一時間待ちだ。
That ramen shop is a famous restaurant with long lines; there's always an hour wait.
人気店 simply means a popular restaurant, while 行列店 emphasizes the visible queues of waiting customers.
Compound of 行列 (line, queue) and 店 (shop, restaurant).