More: Sanguma means different things in different areas, as shown below. It can be glossed in English as ‘witchcraft’ or ‘assault sorcery’.I ran across an email correspondance which includes a deeper description of the linguistic roots.
and a tourist page for Papau New Guinea has this to say:
These sangumas are said to be humans during the day. But at night they posses another spirit that leaves the body behind in sleep. This evil spirit goes out into the night to hunt in the form of animals like dogs, pigs, cats, flying foxes or even in human form for human flesh.