衰落 (shuāi luò): ลดลง

With the opening of new trade routes, this once-prosperous port city gradually declined, and many young people had to go elsewhere to find work.

This factory declined rapidly due to outdated technology and poor management, and within just five years it went from an industry leader to a loss-making enterprise.

Grandpa said that when he was young this opera genre was very popular, but now audiences are dwindling, and it has declined to the point of being almost unknown.

Due to prolonged wars and natural disasters, agriculture in this region gradually declined, grain output dropped sharply, and people's lives became increasingly difficult.