ˈspɪə.hɛd ˈspɪɹ.hɛd ˈspɪə.hɛd ˈspɪɹ.hɛd be the leader of She spearheaded the effort to find a cure for the disease the head and sharpened point of a spear the leading military unit in an attack someone who leads or initiates an activity (attack or campaign etc.)