A bogeyman or bugbear, especially invoked to frighten children. Frequently used in conjunction with Rawhead.
Bloody Bones has been variously described; in some versions he is said to lurk in ponds waiting to drown children; he may also be associated with the apparition of a murdered man supposed to haunt the scene of his murder.
Mid 16th century; earliest use found in Wyll of Deuyll. In some forms from bloody + bone.