打牙祭 dǎ yájì
[have a rare sumptuous meal;have a special dinner] 吃久未曾吃的丰盛的饭菜
偶尔享用丰盛的菜肴。 如:「来!今天晚上我请各位上馆子打牙祭。」
英语 to have a large and sumptuous meal (traditionally on the 1st and 15th of each month)