demon

Universal Words noun 1 an evil spirit: demons torturing the sinners in Hell 2 (informal) a person who does sth very well or with a lot of energy: He skis like a demon. * He's a demon: he gets up early, he works out, he goes home early, he studies, he works out again... 3 something that causes a person to worry and makes them unhappy: the demons of jealousy IDIOMS the demon drink (BrE, humorous) alcoholic drink