“杜鹃啼血” (Dùjuān Tí Xuè) is a Chinese idiom that translates to "the cuckoo cries blood." It originates from a poem by the Tang dynasty poet Li Shangyin, expressing deep sorrow and longing. The cuckoo, known for its mournful call, symbolizes grief and unfulfilled desires. In literature, this phrase often represents themes of love, loss, and the passage of time. It evokes imagery of nature intertwined with human emotions, highlighting how the natural world reflects personal experiences. The idiom is frequently used in poetry and prose to convey profound feelings of sadness and nostalgia.