流行 (pinyin: liú xíng, written "liu xing" or "liuxing") means (of a contagious disease etc) to spread; to propagate. Below: its meaning, pronunciation, stroke order, and example sentences, so you can learn how to read, say, and write 流行.
Meaning
(of a contagious disease etc) to spread; to propagate
(of a style of clothing, song etc) popular; fashionable
For young people, music's social role is equally important. Whether it's KTV, music festivals, or music apps on phones, all of these give friends shared topics of conversation. A popular song can spread across the entire country within days, with people discussing it as they listen and sharing their own feelings.