青衫洗旧
[qīng shān xĭ jiù]
Literally means 'The Blue Dress Has Washed Old'. This sentence refers to an experience of having been through much over a long period of time until the color of clothes fades into a paler state, often expressing reminiscence or sighs of past youth and love that now feel distant yet lingering. It also evokes images and themes related to traditional literature about lost love stories.