Chéng qiáng literally means 'city wall'—a massive defensive structure built around ancient Chinese cities to protect residents, government buildings, and resources from invaders or bandits. The character 城 (chéng) means 'city' or 'walled city', while 墙 (qiáng) means 'wall'; together, they form a compound noun specifically referring to historic, often stone- or brick-built perimeter walls surrounding urban centers.

Most famous examples include the Ming Dynasty walls of Xi’an and Nanjing, which still stand today as cultural landmarks and tourist attractions. While modern cities no longer rely on physical walls for defense, the term 城墙 remains strongly associated with historical architecture, heritage preservation, and traditional urban planning in China. It rarely appears in everyday conversation unless discussing history, tourism, or archaeology.