The crowd was boisterous?
[Pinyin]rén shēng dǐng fèi
[Interpretation]鼎: ancient cooking vessel; 沸: boiling. Describe the crowd's noisy voice, like a boiling pot.
[Source]Ming Feng Menglong, "Waking Up to the World," Volume 10: "One afternoon, Liu Fang was cleaning up in the store, and all he could hear was the sound of people boiling."
[Example sentence]The south pier of the Freeport in Gothenburg is full of music and people, and the sails and masts are like clouds, and a thousand barges are competing with each other.
A sea of people?
[Pinyin] rén shān rén hǎi
[Definition] The crowd is like a mountain or a sea. It describes a very large gathering of people.
[Source]Ming Shi Nai'an, "Water Margin", 51: "Every day, there are those who generally break up, or play and dance, or blow and play, or sing, and earn the price of a mountain of people to see."
[Example sentence] The Dragon Boat Race has begun, and both sides of the Jinjiang River are crowded with people.
XiXiXi
[Pinyin]xī xī rǎng rǎng
[Definition]xiXi: the appearance of harmony and joy; hustle and bustle: the appearance of chaos. It describes the people coming and going, very lively and crowded.
[Source]"Records of the Grand Historian (史记-货殖列传)"："The world is bustling with activity, all for the sake of profit; the world is bustling with activity, all for the sake of profit."
[Example sentence]On May Day, the square was crowded with people.
Menting ruò shì
[Pinyin]mén tíng ruò shì
[Interpretation]Ting: courtyard; Ruo: elephant; Shi: bazaar. There were many people in front of the door and in the courtyard, like a market. The original describes that there are many people advising and admonishing. Now it describes that there are a lot of people coming and it is very lively.
[Source] "Strategies of the Warring States - Qi Ce I": "When the group of ministers advises, the door and courtyard are as busy as a marketplace."
[Example sentence]On the day of my cousin's wedding, the scene was truly a bustling one.
Chuān liú bù xī
[Pinyin] chuān liú bù xī
[Definition] Chuan: river. It describes the continuous flow of water for pedestrians, carriages and horses.
[Source]Southern Dynasty - Liang - Zhou Xingsi's "Thousand Character Essay": "Chuanliu is continuous, and yuancheng takes the reflection."
[Example sentence]On the overpass, bicycles, cars, and pedestrians flow endlessly all day long.