Daily Chinese Idiom Guessing Game
Describes a huge amount of things piled up like a mountain, often indicating an overwhelming quantity.
聚集成堆，如同小山。形容极多。
宋·孟元老《东京梦华录·外诸司》每遇冬月，诸乡纳粟秆草，牛车阗塞道路，车尾相衔，数千万辆不绝，场内堆积如山。”
After the holidays, the emails in my inbox piled up like a mountain.