The word "追悼" (zhuīdào), meaning "to mourn the dead", is formed by combining the characters "追" and "悼". "追" consists of the radical "辶" (movement) and "隹" (bird), originally denoting chasing or pursuing, here used metaphorically to mean "recalling" or "remembering". "悼" includes the radical "忄" (heart/emotions) and "卓" (primarily phonetic), directly meaning "to grieve". Together, they create a compound where "追" implies recalling the deceased and "悼" signifies grieving, thus forming the concept of mourning through remembrance.